Google, especially Google Corp, is very much that way too. One of my users is currently getting a fair bit of spam because a spammer figured out that if they send a message with envelope sender @google.com, rcpt @gmail.com, google.com MX will accept it, then bounce it with NoSuchUser and gmail will accept it. I spent an hour yesterday looking for a way to contact Google about it, but couldn't find anything. Made hard…
There was a thread on reddit from an escort who was on a podcast talking about how she was banned from instagram and facebook (for promoting her escorting!) and the only way she was able to get her account back was to seduce some high-level meta employees via linkedin, date them and then convince them to reinstate her accounts.
edit- not sure if this is the same girl but here is a similar article about this scenario: https://www.newsweek.com/onlyfans-star-slept-meta-employees-...