Hi, I'm the other friend who wrote StepUp.
As of right now we don't have that many users, so instant matching is quite hard. As a workaround we figured we will try to have a limited time window to congregate all the users.
We are actually using a 3rd party RTC framework for our videos, and the blurred is done on the front end.
And as for delete account, that's something we are working on.