Hmmm that's interesting.
I once shortly tried out Airbnb, but quickly deleted my account after learning they want to know everything about me down to the color of my underwear.
I had signed up with an email address xyz@mydomain.tld, i.e. with one of my own internet domains, and now I still receive updates from them, sent to the email address deleted-xyz@mydomain.tld, which of course I can also receive. But most people sign up with more official email providers, so they don't notice this.
That not only shows that my account is not deleted, and merely has a delete flag, but also that they are very uneconomical with sending mails, contributing to polluting internet traffic, guilty of causing externalities.
(Image taken from https://www.thedailybeast.com/how-airbnb-kills-our-ideas-of-privacy — also good further reading.)