Do I get all skins if I go to PBE?

Ok so i have seen some Youtubers videos where they are on PBE and I'm seeing them have all skins.Is it something that you earn in PBE or do you just get all skins if you go there? (oh and i'm not a lazy pos who doesn't like getting off his ass to work to buy skins i'm just asking about this becuase i'm wondering)
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