There are drug dealers living in New York City, does that mean that everyone else should move out?

It's just a tld, there's a million of those. If somebody likes it, why shouldn't they use it? The .cx domain was ruined by one rogue website and the attitude you encourage.

This is good advice. XYZ is a significant spam signal & likely to result in non-delivery of email, which seems especially important for an email notification service.