Yeah, sometimes you have to shell out.

Anything that can run a "real workload" is these days going to be heavily targeted by buttcoin miners and other abuse. Any free trial is ripe for abuse, and it becomes a cat & mouse game to try to identify and stop them before they waste all your resources. Is that fight worth fighting for a small business? Probably not. Yeah, you might lose a stingy few potential would-be customers but that may cost less than the fight. I bet most of these small businesses will be happy to refund your $7 if you try their service, find out that it's not for you, and explain your situation nicely.