Yes as long as business is accessible in EU it must set up hq in one of the eu countries and report data on sellers to that country government. (Thus phone number registration requirement which to have you must show and record ID and personal information to mobile carrier)

how does that work for flohmarkt I don’t know but I can try to set up an instance and we will see what happens. Will there be any nasty letters or not. I suspect as long as it is small thing no one will be interested but if it grew there probably would be an attempt to take it down and fines

I would really really want it to work so we can just don’t care about ever watchful big brother