Even if they could fight, why would they want to? There are lots of us with tiny things on the internet where the burden of maintenance is only slightly below the enjoyment we get making it available. Increase that burden and the costs are negative and things get shuttered.
Question, if I have a small thing and don't want to preemptively concern myself with GDPR, as a non-EU site operator can I tell an information requester "no"? Might I harm my ability as a person to travel to the EU? Ignoring the standard "if you do nothing wrong you have nothing to worry about" and "the GDPR is really easy to understand" arguments, and assuming I'm not wanting to do any real work, would it be wise for me to just add known EU subnets to my firewall?