He used to take advertising but stopped doing it because apparently the forum is sitting on loads of Bitcoins, so he doesn't need more and he isn't greedy.
Someone who knows the history in more detail can correct me if I am wrong.
Yeah the forum has 1250 bitcoin stored in cold storage as per
this thread so yes that's lot of amount as per the current rates also.So for funds part there is substantial amount available for any development to him.
There are threads on Meta about it. But I'm too lazy to look, if you want to, you'll find it. So you didn't come up with anything new or original

If you want to search anything then use
https://ninjastic.space/ for it and you can easily browse for them but if you are talking about these advertising rounds by @theymos they are here :
Advertising Round 353 which was last in 2022 and after that he decided not to do that.