The value of the settlement for Alphabet is not in the stock, it is in the “agreement to ensure that any Waymo confidential information is not being incorporated in Uber Advanced Technologies Group hardware and software.”
Of course, the details of that aren't going to be shared, but that's the thing matters.
> Let's not forget they are a major shareholder in Lyft.
Are they? I know GV has a significant stake in Uber, and Waymo has a cooperative deal with Lyft, but I don't recall Alphabet or any of it's subsidiaries holding a big share of Lyft.
Edit: as pointed out in the response, Alphabet is invested in Lyft through CapitalG.