Google sells (and also owns) domains with exotic TLDs. It's reasonable to expect them to get handled gracefully.

And as the article explains, it was the prefix (web.*) and not the suffix (one.*) which turned out to be tripping their validation rules.

That’s right, you should do the conventional thing by using gmail, and then you’ll never encounter any difficulties because Google never make capricious decisions like (checks notes) blocking access from certain paying customers using a half-arsed regex.