I think this app is probably bad but blocking people is healthy and people who get het up about being blocked are the ones with the problem.

As an individual, blocking people who tax your mental health is healthy. As an app developer, blocking people who try to report security issues is problematic.

There is a difference between blocking people who are disruptive, annoying, etc. And then blocking anyone who doesn't agree with you or levees any amount of criticism of your work. At some point surrounding yourself with only yes men will become unhealthy.