I really love that idea.

Regarding ads, I almost always turn on an ad blocker because the ads I see are over the top and either obstructive or somehow offensive, so figuring out a way to monetize that isn't also horrible is kind of a delicate balance. Like, no autoplaying video/audio, for one.

Tip jars, things like possible user customizations allowable for those that donate above a certain threshold (so like, specific color callouts for donators of $x in the last month, or the ability to add highlights inline in comments, or something) and other incentives other than, y'know, getting your average user to understand that servers and time are things that need money to keep going. That said, that stat page would be super helpful on the main instance page, like maybe over on the side.