Here's what I do: I ride Uber for a while, then I ride Lyft. After a day or two of riding Lyft, Uber sends me a discount on my next 10 rides. When those run out, I go back to Lyft until Uber gives me some more. I never really end up riding Lyft for more than a day or two before I get the next discount email.
Im not sure if it's cause they're spying on Lyft like they've done in the past, or just noticing that I've stopped riding Uber. Either way, thanks go out to all the idiot VCs for making this happen.