Buying RP and getting permabanned

A few of my mates who introduced me to lol said i shouldnt buy RP because its one of the reasons to get my account "flagged" and when i asked what it means they said flagged like suitable for a permaban. Is it true ? If i buy myself some skins will i get my account deleted ? Could you maybe explain to me the mechanism of that ? Why does a dlc gets deleted with the account and why the accounts with RP are especially vulnerable to this ? Also i read some topics on the boards and a lot of player claims that they got banned for using 3rd party software with lol when in reality they only had skype and a browser opened in the background. IM not gonna lie it sounds kinda scary and unjust to me. Please help, im super anxious about losing my acc ! kind regards
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