However, nowhere does it actually specify what sort of scale constitutes "large". I don't see any user count threshholds or anything like that.

Also, it's possible that someone's list of authored memes is personal data. If somebody creates a lot of political memes then this could easily be covered by article 9, since political affiliation is explicitly covered there.

Additionally just saying "have a checkbox" isn't going to cut it. GDPR forbids blanket opt in or opt out schemes. You would have to build a system to track what the user has consented to and refactor all features to abide by each user's consent configuration.

I'm not saying every these tasks are hugely onerous - just that I can see the use case for blocking EU traffic to avoid having to abide by their regulations.