Not just that though, it makes it much more expensive to say create 1M signal clients to try to spam users, deceiver users, or create a DoS. Phone numbers/sims

Not just that though, it makes it much more expensive to say create 1M signal clients to try to spam users, deceiver users, or create a DoS. Phone numbers/sims create a limit on the feasible number of accounts an individual (or even a company) could control.