Waymo - Tip Your Driver

In San Francisco last week so I had to do SF things. I took a Waymo, self-driving taxi. And honestly, it was the most pleasant and smooth ride of all the other rides I took. So it got me thinking... What If you could tip the "driver" and the tip will go to charity? Obviously, tipping has gotten so out of hand that this idea is mostly a joke, but what if that tip could go to charity.