Many of the same objections apply. What is google going to do with a point in time snapshot of "bSSIDs and MAC addresses"? The SSIDs don't tell them anything aside from "there's a wifi router at this vague location". MAC addresses are slightly more interesting, but there's nothing you can do with a point in time capture with them. Even if you want to do evil things like stalking people, you'd need to do regular scans, not the once-a-few-years drive-by they do with the streetview cars.
Also to be clear I'm not claiming that it's fine for them to do it, or that they should continue doing it, only that the scare quotes around "accidentally" was unwarranted given the lack of evidence towards malice and lack of motive. To make an analogy, accidentally-exposed-to-the-public breaches happen all the time. You can complain about how there were lack of controls/security, but people don't typically don't use scare quotes to imply the breaches were somehow intentional.