Is there any possibility user is unaware she is "abusive"?

For example, I quickly searched the ToS for port scanning and didn't find it banned, yet you admit to intentionally frustrate such users.

I am not Fly.io customer at this time but I do port-scan my own services as a realtime security check.

As otherwise great service, you may open yourself for very angry user reviews if the tactic is "frustrate the user".