Do you know how e-mail lets you set anything you want in 'From' field and only relies on optional stuff like DMARC to, maybe, verify it? It's almost exactly th

Do you know how e-mail lets you set anything you want in 'From' field and only relies on optional stuff like DMARC to, maybe, verify it? It's almost exactly the same with phone calls, that 'From' field is just set at a provider level instead of user level - and there are many providers over the world, including some that allow the user to set this field however they like.