Earlier quoted context omitted.
These calls are already illegal. There is a Do not call list. The gov has just been completely inept at enforcement, I don’t think we need extra tax, just enforce the laws we have.
clearly the current model doesn't work well enough. US laws don't stop Nigerian scammers abusing weak telecom systems. Adding a tax paid by the carrier incentivises them to collect it from the upstream chain all the way back to the caller.
At that point, the free market gets to decide if it's cheaper to eat the cost of the call (remember, each subscriber sets the amount of the tax), or secure their infrastructure.