Obviously there are a lot of us uninterested in using twitter anymore, but I think there are other factors:
- Facebook won't just buy you when you reach a million users or whatever, so you need to have a hope of making money someday.
- kids don't have any money and ads are getting drastically harder to target, anyway.
So now the ideal user of a new service is someone in their late 20s or 30s looking to just hang out and shoot the shit with random internet people, as is the millennial custom.
It feels good to be in the target demographic again.