@annaversus It's written in the OP: You'll get the coins in a month. (Don't ask me why though haha)
Regarding the ad issues: I actually haven't experienced any! So I'm thinking it's only a certain region (I'm guessing USA). I'm sitting in Switzerland and can watch dozens at a time. I've only ever gotten 14 coins per video though, so it's really grindy.
Also, regarding the drop in tips in general: It's not strange at all, there's always the most hype about a new feature in the beginning! Furthermore, at first there were only a few authors with tipping enabled, now more and more authors are competing for the same amount of coins, so naturally the rate for each individual author will drop off as well as people prioritize their favorite authors and cool updates. Combine that with low coin reward rates (due to bugs or your country being uninteresting) and you'll have the current situation.
I've been watching videos on and off since I saw this post, but even with all that, with all the cool authors I'm following and the 14 coin rate, I won't be able to tip more than 100 coins each. (It's probably to make me buy coins. I understand. I might at some point, but I really can't spare any money right now.)
Okay that's my two cents. Or coins. Happy tipping everyone!