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I'm fairly certain "slower traffic keep right" is part of the expected flow.

Maybe the Waymo is technically speeding, but so is everyone else, because speed limits aren't magic, and if the de-facto limit ends up being 50 when the posted limit is 40 or 45, going slower creates extra conflict points for accidents.

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Get it straight. It is going faster than the speed limit that creates extra conflict points for accidents. That's the problem. If better enforcement is needed via cameras, radar, etc, then that's the solution....not everyone speeding. Speed kills.
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Just slightly over half of US states require you to move right to yield to faster traffic. In some places it is completely allowable to drive the speed limit in the left lane.

https://www.mit.edu/~jfc/right.html

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