Easier said than done, you don’t get lawyers fees back for winning a frivolous lawsuit, but you are required to pay them if you want to win. It’s entirely feasible for a company to force your hand in this way.

> Especially, if your domain is older than the trademark.

My understanding is that trademarks are about the term being recognised "in common", while a ® is once you pay money to your govt's department for the fancy paper. Hence, if you registered <cool name>.com and sold said cool named game, you already have a trademark simply because you're the author. (Of course, money for lawyers and proving things in court isn't free, but you have legal grounds to stand on nonetheless.)