Earlier quoted context omitted.
No they can't. The scammers will just hire a random person from indeed/monster/whatever, ship them a SIM box and tell them to fill it with prepaids.
There's no reason consumer SIMs should be able to call more than N distinct numbers in any 24h period. You can implement reasonable rate limits to prevent abuse. However, even if we assume that SIM boxes are a magic solution to carrier interventions, that still raises the cost from the current status-quo. Implement enough of these barriers and the entire scam operation becomes unprofitable and no longer worthwhile.
Oh jesus please no, whats next?
Ther is no reason a consumer oven should cook more than 5 meals a day. There is no reason a consumer toasteer should toast mpre than 10 times a day.
The bread you make tourself is unauthorised in a toaster