Worse, they purposely come from the same email address. So if you want meetup alerts for upcoming meetings, too bad, because now you will get all these marketing materials from the same email, which is now subscribed to various promotional lists. I already told google to put that email straight into my inbox and now I get all that junk too. This is 100% intentional because most people aren't going to click unsub per domain or start writing rules analyzing the ever changing subject line.

You can tell which companies have especially corrupt and greedy corporate cultures by how they treat your email address. Whenever I find myself witnessing behaviors like this I do my best to move off the platform and bad mouth them whenever I can.