Dunno why the comments aren’t there anymore but nothing here is even remotely against GDPR, as no user information is actually given to the new meeting host.
Well, (co-)organizers can, sorry if you never found the right button... but I got this beautiful Kubernetes-XXX_Member_List_on_2022-06-30.xls which contains:
Name User ID Title Member ID Location Joined Group on Last visited group on Last Attended Total RSVPs RSVPed Yes RSVPed Maybe RSVPed No Meetups attended No shows Intro Photo Assistant Organizer Mailing List URL of Member Profile
I guess that totally falls under GDPR, just that sadly we're not in Europe.