Ehh ... is Wikipedia seen as "not innovating" or "evil"? Craigslist? They haven't really changed their core model (except for Wikipedia's recent more minimal look, I guess, but that's a pretty small change in the last decade). Wikipedia went the direction that once they had more money than they needed to run it, they started to do other stuff. I think that's great. Once your killer app is hugely successful, stop messing with it. Focus on running it efficiently and reliably with a small crew, and take the ongoing income from that to try other things.

Yes, the companies you listed are viewed negatively, but that's not because they have a sustainable business model. Don't underestimate the many perfectly valid reasons those companies earned their reputations.