If they don't share the data then businesses will start being bombarded with bot calls (whether they know they are bots or not) once businesses start copying it

If they don't share the data then businesses will start being bombarded with bot calls (whether they know they are bots or not) once businesses start copying it, which should lead to regulation, however with how easily scams happen through the phone lines - I don't know how they'd be able to regulate and enforce this either to protect businesses' time.