For "legitimate" (the kind that's not a scam, just annoying) they are regulated that it wouldn't be legal in many jurisdictions. (at least in B2C context -- maybe it a bit lax in B2B, considering Google's already using some form of bot to confirm business hours for Google Maps listing.)

Scammers in other hand already employ illegal robocalling tactic, and I can see some may opt to use systems like that if the price is right.