Some hosting providers (hetzner) are very scared about any letters so they will boot you for getting any random letter.
They usually forward the takedowns to me, I take a look at them, let Hetzner know they're bogus claims and that I'm not planning on taking action, and that's where the story ends.
I followed the DMCA process, added nginx block rules to make all the content mentioned in the DMCA notices impossible to access, and even submitted "statements" to Hetzner for each DMCA notice they got. None of that saved me.
It’s not whether the complaints are real; it’s whether the recipient has some policy that says “X number of complaints and we show you the door.”