Except the "bad actors" are the ISP's customer. It's they who are asking for the bits to be sent. It's the ISP job to deliver the bits their customers requested.
The streaming services are not dumping bits on to the network like a chemical plant polluting a river. The streaming services are sending bits that the ISP's customers requested.
The streaming services are paying for their Internet connection, and ISP's customers are paying for their Internet connection, and it is the job of the ISP to connect the two.
If you can't currently handle the traffic:
* reduce the service that you offer, or
* build a better network.
The ISPs need to do their damn job.