Earlier quoted context omitted.
Presumably Waymo complies with their legal obligations... The point is that there's a process, it applies both to Waymo and to you as a rando. The police don't have special access to Waymo cameras.
So if I sent an email to Waymo I could get camera footage of a crime?
Even when you've got your own camera on your own front porch making recordings on your own hard drive using your own isolated network: There is are long-established legal processes by which you can be ordered to hand over [a subset of] those recordings.
Neither Waymo nor you, yourself, are exceptional to these processes.