Well that does suck. I would also wonder if that's a legal battle they would win.

I've never used Spacelift, etc. so I may be off base with the comparison. But I think about them like specialized CD tools that do nice things with/for terraform. Their value is that you don't have to implement these nice integrations yourself in e.g. Jenkins.

So replace Spacelift with Jenkins. There are some community plugins that idk, facilitate reporting plan impact from code changes. Is Cloudbees now in violation of Hashicorp's license?

Regardless, good luck.