You only have to run the privileged process that talks to the GPU in ring0 right?

People will care if and when Uber figures out autonomous taxis and can continue their ridiculously low prices without losses.

Probably not even then. Plenty of companies are in the automated-vehicle race. A number of which are a) profitable, and b) worth more than Uber. Some of them also manufacture cars and have decades of vehicle experience to draw on.

Uber made a grab for dominance based mainly on brand (plus massive subsidies). Foolfoolz is right; this suggests that the market just isn't particularly sticky. Brand isn't enough.

At which point that tech too will be a commodity, unless you see Uber having some edge in autonomous cars, and why would they?

The biggest advantage: It's free.

It looks like we used to have something similar but it got deprecated. https://tools.ietf.org/html/rfc6633

I was a big fan of ICMP Source Quench in the early 1980s, but it wouldn't help now. It doesn't have authentication.