It said it was when I created one before posting to make sure I was thinking of Gmail and not Fastmail.
Not sure why there'd be a dropdown to select the service if not, maybe I misunderstood
E: I misunderstood, you're correct. The dropdown is for your reference (e.g. "Mail [on] iPhone") and if you select "Other" it's the same as selecting the other dropdown's "Other", it lets you type a custom name. Guess that was never as secure as I'd thought!
I've long since moved to Fastmail which does do the limiting by service, thank you for correcting!