People will always find ways to use things to the limit or abuse them. You need to consider where to put the limit to balance user experience vs. preventing abuse.
As things stand there is no point in going legal. Either let it slide or block them and use it for PR with a blog post and an HN submission (wait a minute ;)
What silly "all or nothing" thinking.
You don't have to "go legal" on every free trial abuse, just the egregious ones. Here we have a company that's been abusing the free trial for 10 years and 1000s of instances. Vates rightfully can claim millions (~40M to be exact) from this instance. The company, in particular, can't claim they didn't know this wasn't allowed because they automated creating fake email accounts to abuse the situation.
It's particularly more egregious because Vates allows companies to build and maintain the software directly without support for free.
Be kind. Don't be snarky. Converse curiously; don't cross-examine. Edit out swipes.
When disagreeing, please reply to the argument instead of calling names. "That is idiotic; 1 + 1 is 2, not 3" can be shortened to "1 + 1 is 2, not 3."