Earlier quoted context omitted.
That is incorrect. You don't need to specifically target the EU. If you handle data from European citizens, the GDPR applies to you.
I'm baffled. Why the downvotes? See for applicability: https://gdpr-info.eu/art-3-gdpr/ Also, in the case of HN, YC offers a service. Just like a forum is a service, this discussion and news platform is a service. It's irrelevant if it's paid for or free.
Because HN is now like Reddit, but for techno-snobs. If you don't follow the tightly defined groupthink, you'll get downvoted.
Many years of discussion groups have proven that downvoting has a chilling effect on discussion groups. Allow upvotes, and "spam" flags.