Was the number used to sign up for, and receive communications from credit card companies? Is the ban related to signing up for +100 cards?
https://www.dannyguo.com/blog/my-credit-and-debit-card-colle...
https://www.dannyguo.com/blog/my-credit-and-debit-card-colle...
That's a good hypothesis! But I have a strong preference for email over SMS for communication from companies, so I receive almost no texts from credit card companies. It's pretty much limited to an occasional authentication code for logging in (since TOTP-based two-factor is so unfortunately rare).
To be clear I’m not saying it’s ok. Google should make it right and then invest in a scalable way to not keep doing this.