That was my thought. Unless I can create multiple numbers and disable them at will, this is quite flawed.

With a virtual cc number, I create a new number on demand for each service I need, and disable it after I don’t need it anymore.

With virtual email addresses, I create a virtual address and delete it after I don’t need it anymore.

Unless there is a phone number analog, a single number is only useful until that number is compromised. Which could be day 1.