https://res.cloudinary.com/dolstrmxz/image/upload/v1565042903/ads.jpg
its interesting that a website that has access to League database by riot permission is allowed to advertising Eloboost and selling account websites. great.
League API is open to everyone to use provided they don't directly profit from the use of it. Advertisement money and charging to remove ads were two acceptable methods of support.
There are no stated policies about what ads were to be blocked or disallowed.
Here's the site to start using League API in a program you make
op.gg isn't run by Riot, so it is none of Riots concern what they advertise.
