> And I'm sure Toyota will design it so that hack isn't too difficult.

And that's how to get these banned.

People reflash these to remove the speed governor, then drive them on regular roads. These things hold up traffic, piss people off, who then complain to law enforcement. The police do nothing about it so the issue gets raised to state and federal legislators, who do take action.

You can get away with a lot, so long as you don't bother anyone. The EPA didn't crack down on diesel tuners until coal rolling became enough of an issue that people complained about the lack of enforcement.