> maybe you could embarrass them about their lack of network engineering knowledge

I’m fairly certain it’s possible to do much worse to a laywer, especially a technically clueless one.

Defending oneself from a frivolous lawsuit (e.g. judge has already said ‘you can’t do that’) in a sensible country like Germany might not cost you anything.

Much, much more likely however, is that they wouldn’t go to court at all (because, you know, they would lose, and even if both sides pay their own cost they’d lose more money than they could potentially make).