@CarolynStirling
It works well.
If you only allow celebrities, certain classes of journalist, etc. onto the platform as creators and the 'regular people' to consume until you're 'stable enough for capacity testing' you build in a group that has a head start.
Worked for Gmail, Facebook, etc. People enjoy feeling exclusive, look at how quickly they moved away from the checkmark once it was obtainable by 'regular' people.