I know it's a joke, but: If you're all in the same place, it's not a "Distributed" Denial of Service. And if you order cars, they arrive, and you pay for what you ordered, it's not actually a "Denial of Service" either — cars for pay is literally the service Waymo is offering! It's more like (as the tweeter points out) "if a big concert had just ended."

Apparently the event pictured happened in July, even though the tweet is from October.

https://xcancel.com/rtwlz/status/1977443969115029847

"The plan? At dusk, 50 people went to San Francisco's longest dead-end street and all ordered a Waymo at the same time.

The world's first: WAYMO DDOS

We didn't actually get in the cars. They left after about 10 min and charged a $5 no show fee. Waymo handled this well. I assume this isn't much different than if a big concert had just ended. Eventually, they disabled all rides within a 2 block vicinity until the morning "

50 people standing together on a street is the polar opposite of "distributed"

Would be very funny unless you lived or needed to travel in that area