why would you trust any other website except major leagues annoucenced on this website? no one ever should trust anyone telling them to sign in to a website EVER
to expand this, any API (discord, steam) login that you go through isn't harmless in of itself, it cant make changes on behalf of your account unless you specify that it can. its very hard to distinguish the difference and it can make or break your account so be very careful on sites you do not trust 100% or was told by someone you do not know.