So I just sign up for $60, collect a bunch of calls and then report them all a spam, earning me a guaranteed $1000 from the phone company?
If you're acting fraudulently and at scale, there will likely be consequences.
If this happens occasionally, it's a feature of the system, and your reports effectively become a super-opt-out.
And if perhaps the problem does become sufficiently widespread, I'd be interested in seeing how you'd address it given one constraint: operating within the bonding/surety system I've suggested. And that the State of California and others have already enacted in some form.