I could understand limiting new registrations, but permanently and irreparably breaking people's website domains and email addresses feels pretty hostile considering how little resources this must take up.
The historic information in here was really interesting, and a great example of an article rapidly expanding in scope and detail. How they combatted corporate IT “security” software by pretending to be a VPN is quite unexpected.
I do something similar, it's been fun journey of issues over the years.
One company gave me a free version of their paid offering because my email address was [email protected], which triggered their "is an employee?" check. (I reported it to a friend who worked there, but they didn't prioritize fixing it. Lasted a while.)
Uber tried to make me change my email address because:
> As much as we appreciate your enthusiasm, and value you as a loyal rider, I do need to ask if you could, please, update your email to something that doesn't use "Uber" in it, as that's technically a trademark violation.
> I apologize for any inconvenience that may cause and thank you for your cooperation. If I can help further with making that change to your email, please let me know.
They backed down, but it was pretty amusing to get this email in response to a totally unrelated one.