Are we talking about the same twitter? My understanding is they are not doing some well currently. Just because the doors are open for business doesn't mean said business is thriving.

Also, twitter is a platform that has exclusivity. Uber is easily replaceable with Lyft or a taxi service's app. Just because a friend is using Uber doesn't mean I have to. The same doesn't apply to twitter, the platform is the value. This is what kept and keeps twitter afloat, Uber on the other hand paved the way for a shift in the way we consume cars as a service.