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I guess that's semantics. If you opt in then yes I guess they could do anything. I think the point was that enshitification would occur if they forced you to do that.

You could opt in to have blood or plasma taken on every ride if you so wanted I guess.

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Rough figures:

As a plasma donor you can earn $30-$70 per session for 800 ml. Let's call it $50. A session takes about 90 minutes, or 533 ml/hour, and you make $33/hour

Waymo charges $0.50 - $1.00 per mile. Let's use the high end.

To break even, your Waymo will need to consume < $33/hour, or < 33 mph. That's not bad!

If you go any faster, you won't be able to extract enough plasma in the same amount of time.

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