Any place where scaling customer support to the revenue vs number of users tends to lead to a lack of phone numbers.
(Googler, opinions are my own)
You can get a hold of someone but they can’t really help you. When issues crossed over into any other area (engineering, other Google products, etc) the answer was basically “I can put an internal ticket in… but you probably want to find a workaround.”
We were only ever contacting them for bugs/issues with Google products or internal processes they had screwed us, not for “help me use the product” type support. Maybe they would have been more successful with that.
Google Ads sent me an email saying my ad was rejected, then billed me anyway. No idea if the ad ever ran, but they attempted to charge me and suspended my account when the charge didn't go through. It was difficult to get in touch with a support person because they do not offer phone support for accounts that are suspended, and I ended up paying for the ad without ever talking to someone over the phone to figure out why the ad was run after it was rejected. I filed a web form request after payment asking that they reinstate the Google Ads account, but they rejected the request.
I was billed twice for a certain month of Google One, and I had to file a web ticket and send emails with screenshots in order to get one of the charges reversed. There was no option to talk to a person.
This makes sense, and yet Google will apparently be requiring phone numbers for apps that aren't monetized at all.