Earlier quoted context omitted.
AWS provides a service that you can use as a commodity, and with appropriate backups, can easily recover from. DNS is the magic here. Unfortunately (with the exception of SIP dialling, which is extremely niche) there is no DNS for telephony. If your provider cuts you off, you can’t transparently move away, and number porting is slow .
Do you really think the typical aws customer can easily recover from being banned?
That isn’t the case for PSTN. It’s outright impossible.