A perfect illustration of the "entitled developer complex". Failure to properly research Slack, a bad use-case, complain about pricing, then publicly bash.

I've seen this repeatedly with my own startup (https://commando.io), and honestly this user profile is the worst. They won't pay, or will pay very little, and expect the most. They complain about the underlying codebase and stack (PHP), and fail to solve actual problems. They get stuck on details that don't matter.