I am not sure how using anonymous emails for sending texts works. However, if someone were to do something like "fax-in" a bomb threat or say there will be a specific horrible event in a specific location (as a prank), it would likely elicit a serious response by the local government (they would have no way of knowing if the threat is a prank or not), and after the fact, law enforcement is going to put serious resources into finding who sent the threat.
You have a very vivid imagination
That has nothing to do with Fax Bomb Mass Killing Machine, and I said before that I can call from anonymous burner phone or simply write and send anonymous letter, that nobody can track.
Government apparatus is the real dangerous parasite in this case, not regular people sending fax messages.
They also can't do anything to identify the guy who is sending Bitcoin to some other guy with non-custodial wallets, that are not connected with their identity.