This type of attack can happen on any domain-based system since the attack involved buying a domain name and pretending to be someone else. For example, someone could buy a domain name with your name, and set up a Mastodon server. It is the same technique used in phishing, but in this case was used in an extortion scam against people with a large following.
If you are or plan on becoming relatively popular, it is recommended that you purchase the domain name with your name, if available.
