Unfortunately, there are a lot of events/organizations that organize almost exclusively through Facebook. Unfortunately, there effectively no other free platforms with a critical mass of sign ups big enough to be used in that way.
Unfortunately, there are a lot of
events/organizations that organize almost exclusively
through Facebook
If your business, event, whatever relies on the fact that I have a Facebook account then fuck you very much! I'm not interested.
Eg. I've seen some housing communities use FB for their mailing lists.
I think the best option is to create dummy throwaway accounts if there's something on FB you really need access to.
WeWork bought Meetup recently so I don't know if any of that will change now.
Everyone has the gmail they probably created just to sign up for Facebook, since it seems this younger generation doesn't believe in email.