May be a lot of text this so bare with me
On the UK or NA boards occasionally the infamous post will rear it's head.
"Riot forces me to loss after a win streak"
or "Riot puts trolls/Afk'rs in my promos".
The post will start out well with a few agreeing, sharing stories etc, but then players who love the game & Riot its self will step in and chaos ensues. Any tangible logic is lost and it ends up people dissecting each other's gaming history along with their KDA etc. So no one ever really gets anywhere.
Party A: states 50/50 win ratio seems forced
Party B: defends with no it's the MMR system, negative bias on behalf of the player, tilt, or generally no Riot wouldn't do that, why would they.
So the recent winter of 2017 was an interesting time for gaming. Many things were brought to attention by gaming media and content providers on Youtube in respect to many forms of manipulation in place in games, geared towards the influence of a player to spend money, or simply to ensure they log in each day and keep playing. All of which started first by Shadow of War, and then Star Wars Battlefront 2 (a game which will probably remaing infamous for quite some time as it's single handily brought about change to effect the Industry as a whole & micro-transactions going forward forever).
The lesser crime of manipulation is keeping you playing naturally (and this is incredibly common in any game, not just those multiplayer based), but when it likely compromises your gaming experience people naturally get quite grumpy. So even this lesser crime of subtle influence has been researched and commented upon with the upmost scrutiny.
Ok so, instead of me typing out more of what could be seen as just my opinion lets get to some of the content I just spoke of, which delve into just what's going on regarding the methods of influence/manipulation in play today, or planned for tomorrow.
Here's the first video from Jim Sterling:
https://www.youtube.com/watch?v=E_QaTtvI2tg "EA Proposes Unfair Matchmaking To Raise 'Player Engagement' & Monetization"
So after watching that you get an idea of just one companies attempts at constant revenue through the match maker.
Here's another, only this time it's Activision/Blizzard:
https://www.youtube.com/watch?v=ZSpP3Ge-dq0 "Activision Patents Microtransaction-Based Matchmaking"
Last one of this type regarding UBISoft, and "live service" games (in this video Tencent is mentioned, we will get to that company shortly):
https://www.youtube.com/watch?v=eSQOJqikw8c "Ubisoft Thinks Games Are A Thing Of The Past: It's All About Live Services Now"
*The above video is loosely related to online Esports games like LOL, but it does again show the current attitude and methods used now in the Industry to affect/influence players.
Now this video is directly to do with third party companies, offering their services in training & providing software for game studios wanting to use micro-transactions :
https://www.youtube.com/watch?v=TQsc14gDPbk "Turning Players Into Payers".
So this all tells us Industry wide, however subtle, there's a real evident desire and wide spread practice of encouraging someone while playing to either:
A pay more than the player initially intended
B Keeping the player engaged daily and hooked to the product. Creating your addiction if you like.
Now all three companies first mentioned up there (EA. UBI, Activision) have something in common. They all have dealings with an Eastern company by the name of:
Here's an article from July 2017, on this company and how its "influence" in game methods have affected players negatively, and how this has become a grave concern in China:
What does this have to do with Riot's match maker you say....
Well take a look at this video:
https://www.youtube.com/watch?v=R-I__IG3Ooc "League of Legends Dev Riot Games Now Fully Owned by Tencent - IGN News"
So you ask Why would Riot (or should that now be Tencent) manipulate it's match maker?
I would answer with all the above and first say, it's HIGHLY likely they are lightly influencing cosmetic micro-transaction's (and perhaps new champion purchases when they first drop) in regard to who you are put in game with, both on your team and against.
Secondly I add and more importantly, they are attempting control on how long you are playing the game. By throttling or decelerating rank gain they aim to keep you hooked, keep you logging in. Longer you play more likely you will naturally lean towards my first answer above and pay for something. All that is done in the game's biggest draw where a majority of players are daily:
Solo queue ranked's match maker.
How they create the bias towards wins and losses could be done in a variety of ways as they have numerious factors at their disposal, from AFK players or trolls, players with high honour votes and no reports, or to just putting you with players who are currently on a tilt/Win streak.
So to truly look at why Riot would attempt something most LoL players frequently & routinely brush off as a conspiracy or ravings of a person in denial, I'd ask you to take a look at what's going on in gaming as a whole right now, read the articles & watch the videos.
It's not really that far fetched an idea at all, in fact it makes perfect sense to do so when you have a fandom as huge as League of Legends, not to mention a titan of an Esports scene for your product.
It's just good business, as tweaking that match maker, how ever subtle, keeps you in business... for a very, very long time.