I was on a site buying icons the other day and it occurred to me. There is no way for me to know for sure if this icon I am buying is being sold by the original

I was on a site buying icons the other day and it occurred to me. There is no way for me to know for sure if this icon I am buying is being sold by the original author. I've been buying 3D models and going through the same thought process. I pay and follow process to ensure that every i is dotted and t is crossed, but ultimately in the future I might find that I still have copyright issues because intermediary parties weren't honest. This story, while allowing people to yell about inconsistencies and hypocrisy, is just not interesting unless someone, anyone, knows that they intentionally and knowingly used unlicensed content. When someone downloads a movie through a pirate bay link, they do know what they're doing.