I use a .one for a project where it makes perfect sense. Brevo, who are a huge email delivery platform, told me they don't support signing up with a .one domain. Fortunately, after a couple of weeks going back-and-forth one of their developers eventually saw sense and fixed it.
Sadly, with Google, I don't think you'll ever get the issue that far up the chain.
I've got a .email domain which various UK based retailers insist isn't a real domain from which email can be sent. I've been trying to convince Argos that it is real for about seven years.
To their credit, my building society actually took it all on board and fixed their system within a few months. To my incredible surprise, so did a major insurer.
Somehow I suspect GDPR isn't engaged there as they forbid the creation of an account in the first place, so they don't store the data. Maybe I could create an account with a different email address and try it then.
Sadly, with Google, I don't think you'll ever get the issue that far up the chain.