Do you think if the complaint went to a government official in the EU they would throw down the hammer on a site that was up for all of a couple days in GDPR time?

I have my doubts.

I've got a handful of sites (ultimately for portfolio / coding practice type stuff) out there. Honestly it wouldn't take me too much to respond to someone's letter considering the simplicity of the site(s), not that anyone uses them.

I also really wouldn't expect any EU official to throw down the hammer on me. Personally I wouldn't panic, and I'd at least wait for the EU official to weigh in before panicking.