Per one of their engineers it's probably in the ballpark of one intervention per 50 trips: https://x.com/brianwilt/status/1850667523781562534

But also, each intervention only makes up a fraction of the trip's duration. So one operator might be enough for hundreds of cars. That doesn't include operators for cleaning, charging, maintenance, and other downtime activities though.

watch that live stream of the depot to hey a feel for how few people it takes on the ground. And because customer support isn't remote driving the vehicles, but merely aiding the classifier, they don't need to be somewhere close enough that latency is totally minimized (aka cheaper than the Bay Area or an expensive part of socal).

Of course, however, your can't forget about the literally billions of dollars and decades of time that were plowed into R&D for them to get this far. All that wants to be recouped at some point.