By evergreen I mean continued rewards after the 7 day mark. But it's not clear to me what the exact best way to structure it is or how to fund it. I have a few ideas which I'm chewing on but the thing that's clearest is that it's needed and I think it's solvable in some way.

I'm 100% against using Google ads in any capacity. I'm not against ads per se but definitely not by a third party. I have an idea for a Steem based ad network but that's another story ;)