I did say potentially

In this case no it is not a small company, but I have seen people sign up to things with random email addresses that did map to small-time company domains.

Just be a nice guy, avoid the risk and use example.com is what I am trying to say.

x.com was originally PayPal, so eBay owns the domain once they acquired them.

Somewhere in Nigeria there's a legitimate Pfizer sales rep who's having a heck of a time getting his emails delivered.