CF should have kicked them off long ago, but when they say "Escalating threats", they're really underselling it IMO. KF already tried to murder Keffals via swatting, so I have a very hard time believing the "it's only for teh lulz" crowd.
While that is obviously the intent, the fact that "swatting" even works is serious failure of law enforcement and I don't understand how the public still accepts it after all this time.
I don't think there's a simple way to stop swatting, though if a streamer/someone else who is a likely swatting target phones ahead of time and asks to be put on a "likely to get swatted, please disregard suspicious calls" list then the police should honour that list (AFAIK there is something like this but it often doesn't help).
But you shouldn’t trust (meaning the way you’d trust a person you know) any business. Especially not well run businesses! They’re not people— and the better run they are, the more Machiavellian.