It’s politics, politics, politics. From all angles and perspectives, in the possibly most annoying way. You have to make so many politics and policy decisions that all have many up- and downsides and that are just plain hard to make.

From a technology perspective Twitter is not at all interesting and the rest is just plain annoying. Plus, it’s a small social network, mostly relevant because important people (imagine myself rolling my eyes here) are on it. So doing other social media stuff that rely on network effects? (Messenger, payment, ...) Not really realistic. Not because the technology is infeasible. None of this is a technological challenge. It’s just politics and network effects.