[black_puppydog]

Not sure how this can possibly be legal in the framework of GDPR. I'm not a lawyer of course, but treating data is tied to a purpose, and treating it for some other purpose requires new consent. (IANAL of course)

So if someone comes in and runs the same community, that's one thing. It at least kind of still does the same thing.

Harvesting the user data and then offering speed dating stuff that's completely unrelated, as one comment here describes, that's just grabbing "random" data off the webs and starting spamming; no relation to the previous purpose of data treatment. And meetup making a profit off of that... I mean, again, I'm not a lawyer, but that's certainly against the spirit of the law.

[cookiengineer]

Fun fact: deletion of your messages is not possible. Meetup can only manually delete all user data, and doesn't have a possibility to delete data by purpose.

I filed a complaint to the Datenschutzbehoerde here, but the legal process takes a while.

If you want to do something against this, find out who is the representative for your state or country, and tell them about it. Usually they have a website for this, and need some screenshots or documents as evidence to start the legal process.