[codesci]

I think the point the poster is making is the specific type of disposable address they've used. Addresses on mailinator.com can be read by anyone without a password (go see for yourself). Presumably anyone could just do a password reset and take over the account.

However, just because they used a disposable contact email in the whois record, it's not necessarily the case that they used the same for the registrar account or anything else (so taking over the domain isn't as easy as implied).

In any case, I don't see any issues with "disposable" email addresses such as a random alias on a private domain with a catch-all.