I want to know if I need a cookie notice on my personal, non-commercial, USA-based website.  My site requires people to register if they want to see all of the site’s content.  I use cookies so that returning users don’t need to log in each time they visit.  The info they are required to submit when they register is name, email address, city and country.  More than half of my users are in Europe (although not necessarily in the EU).

By “non-commercial” I mean (1) the site is completely free to visitors, (2) there are no ads, and (3) I receive no revenue whatsoever.

I did read the GDPR a few years ago (before cookie notices were a thing) and it is very clear that it pertains only to commercial sites.  But I know nothing about cookie-notices, not even by whom they are mandated.