There's a lot to like here, this team ships a lot of stuff, but I don't know about Vector.
Back in the day a plethora of popular apps launched as improved functionality for existing products.
From iPhones to Google these apps were popular because the platforms were very popular. And... they got replaced by features the platforms added.

Vector feels like 'follow' & 'feed' features on Robinhood or Binance.

https://open.spotify.com/episode/3lrm35rrlgCoewFpAQn7ou?si=9d4f4d8c2a144635