That’s another big claim. If Google did this covertly, and it was found out, Google’s reputation would be in the toilet. That’s why I think they don’t do it.
Wasn't google caught illegally collecting hundreds of gigabytes of data from wifi networks already? They don't care.
EDIT:
Yep https://www.wired.com/2012/05/google-wifi-fcc-investigation/
Also https://oag.dc.gov/release/ag-racine-leads-bipartisan-coalit...
If you're counting on fear of possible embarrassment or bad press to keep companies honest you're in for a bad time. Legal or not, if something will make a company money, they will do that thing.