Paid apps are also inherently less viral and can’t tap into network effects as well due to the friction resulting from payments. In order to overcome this, PCC apps need to develop a viable revenue model without putting a paywall.
I see the PCC model work for applications where neither the consumer and the business want to store sensitive data because the security overhead is too high.
E.g. trading bot that doesn’t want to store user’s API keys. In fact, running private servers is something that is pretty common in that world.