Uber can't be profitable without autonomous vehicles, so the answer IMHO here is simple.
For Alphabet, the answer is similarly simple - they'll partner with literally anyone to get distribution.
The first half of your comment implies that Uber has a really bad negotiating position, so Waymo must be extracting most of the value.
The second half says that Alphabet (the majority owner of Waymo) will "partner with literally anyone" which would presumably mean Uber is extracting most of the value.
So which is it?
The second half said that Alphabet had choices on who to partner with, so they could play them against each other, so Waymo had the upper hand in negotiations.
If the self-driving and/or roll-out is a disaster - blame Uber.
Uber has a terrible reputation. I don't think too many people will think twice about Uber taking the blame.
says who?