(adsbygoogle = window.adsbygoogle || []).push({}); I'm a bit confused with this kind of market.
I got interested after seeing multiple accounts with thousands of plat trophies and every game 100% complete.
I wanted a level 200 account, it means + or - 1300 plats (right ?). I don't want to mod my main account.

But... can I trust in any of these guys selling their service? Because if I waste 100US it means 350BRLS in the trash.

if you really want to go about it, yes some are trust worthy. Some are scammers. Either ask around, do your research, or look at credentials.