> I think most people are concerned with making sure they're not actively supporting and organization currently behaving badly (and I pretty strongly believe that Uber isn't)

I don't think that's morally right to only consider that. Even still, I don't see a reason not to use Lyft. They are more or less identical products at this point. One is owned by a company that used to do some pretty bad things. Why support the people that funded that and people that supported those people? Why take the risk it could ever happen again (even if you assure us it won't)? If you fall within those original parameters I set, I think there's no excuse for not using Lyft.