It's certainly something to keep in mind. But there are problems with a similar outcome that could arise by using a third party provider like Gmail. They could

It's certainly something to keep in mind. But there are problems with a similar outcome that could arise by using a third party provider like Gmail. They could suspend your account for example which is far more unlikely to happen with a domain. As long as you pay for both it and your server/email provider you should be good. I personally would rather risk what happened here than dealing with Google in case my account got suspended.