I do this, too - but I've been running into more and more companies that block you from using their company name in the email address.

It also results in awkward conversations if you have to talk to staff. I had ordered some pet supplies online a while ago registered like this.

Then I go in store more recently and they ask "Do you have an account with us?", I give them that email when asked, which causes them to pause. We went around a few times of them asking what my email was, before getting a manager who thought I was doing something dodgy and decided to try looking up my account by phone number instead of email.