Can someone please explain how this isn't bribery in disguise? I'd have graduated with honors if my teachers accepted tips

If you tip enough they even put your name on one of the buildings.

It's not bribery because it's not degree courses. You can go on countless apps and sites and pay to have people teach you stuff.

I don't know what the op is referring to but just a guess. I know one app, HelloTalk where I think you can get paid to teach language. Think of it as zoom + twitch but centered around language learning. You can run a channel (twitch style) and you can take private "zoom" calls for money. Apple is probably taking 30% for those calls.