They're locking down ISPs and cloud services and making subscribers show ID, why was this never done for the PSTN?

Phone numbers aren't 100% attributable like they want ISP and cloud accounts to be, this is why robocalls still exist. Why do TPTB demand an end to anonymity for internet users, but not telephone subscribers?

accounts anonymity cloud cloud services demand down end internet isp isps making numbers phone phone numbers privacy robocalls services subscribers telephone