OAuth2 is a really complicated standard and is complicated to get correct. I mentally compare it with SIP which also has several open-source implementations but

OAuth2 is a really complicated standard and is complicated to get correct. I mentally compare it with SIP which also has several open-source implementations but still often ends up getting outsourced to others due to the sheer complexity of the thing. Though in OAuth2's case I'm willing to say it's complicated because security is complicated. With SIP I really don't know why lol.