Apple’s whole marketing angle is based on privacy to differentiate themselves from Google and the others. If they get caught doing something stupid it seems like that would cost them more than they would make from the stupid stuff.
I don’t have specific data on Safari, but Apple choosing to do pretty much all ML stuff on device and leave it there bodes well for their general thoughts on privacy when compared to pretty much every other company that wants to pull all that data back so it can be used for other things.