You're really going to run into trouble with the "no credit card required" thing - people are going to use your service to, at worst, spam and abuse other people and, at best, mine crypto.
Webapp.io's money making part (which facilitates this) is a DevOps company (CI/CD, preview environments, etc) which is already hammered with that sort of thing - see this post (from when we were called LayerCI) discussed by TravisCI for context: https://blog.travis-ci.com/2021-10-20-mining
[I am not parent poster] A new product launched. Abuse can be ignored in initial stages (indeed, it can be useful as a stress test and for boosting user numbers).
Crypto miners and spammers become a problem when they are crowding out legit customers, at which point they'll be pruned, and new signups will require credit cards.