The point is when there's damage, it can be billed to the malicious actor in question.
At some point, the people who tent to leave a mess in Waymos just... won't be allowed to ride in Waymos any more.
Starting to sound a bit like a credit system or some other dystopian shit show. You do something dumb, drunk while in college and you're cut off...sounds amazing.
This would reductively mean a more effective form of punishing vandalism, which would in of itself be a slight net good overall.
In the ideal case, there would be a recompense program to pay for the damages made + extra, in return for being able to ride them again.
Meta-point: This discussion has significant overlap with busses/trains/public transportation. How we deal with bad actors in that space would translate well into this space.
But for some people, a fine is just the cost of doing the thing. And for every bad actor you ban, there's another bad actor willing to take their place.
A friend of mine works night audit in a rough part of the valley. As soon as he says the magic words 'we require a major credit card or a $300 deposit', they immediately hang up.
Sure you can pay in cash at the end if you want.
But you can't get a room in the first place without a credit card, even if they never charge it.
(I mean I'm sure there are some exceptions somewhere, but generally speaking, no, cash isn't sufficient.)