I'm going to take a guess here that you're in a bubble. Most people don't give more than a passing thought to protecting anybody else on the road but themselves and their own loved ones. You could say enlightened self interest means this should extend to random strangers, but I bet that as a practical matter it does not. I'd even go farther and suggest that the largest plurality of people who support public transit want it so that it will take other people off the road, not them.
Also a lot of cars have a lot of limitations with comma.ai. Yes, you can install it on all sorts but there are limitations like: above 32mph, cannot resume from stop, cannot take tight corners, cannot do stop light detection, requires additional car upgrades/features, only known to support model year 2021. Etc.
Rivian supports everything, it has a customer base who LOVE technology, are willing to try new things, and ... have disposable income for a $1k extra gadget.
The Rivian app does not permit you to send a command to the car while the app thinks the car is processing a command. Trunk opening? You can’t unlock the door. On top of this, if you try to open the trunk while outside Bluetooth range and then Bluetooth connects, you are still stuck waiting for the pending command to complete.
Oh, and the ridiculous “hey let’s always remind you that you own a Rivian” Live Activity seems to synchronize on a schedule that involves being hours and hours out of date.
The Rivian app sucks.
I was so used to this that when I started looking for this setting in UniFi OS I had forgotten the part 'networks are not supposed to be rebooted frequently!'.