I think calling it the "biggest reason" is wrong but not necessarily entirely wrong. There's a difference between Google's reasons and your benefit. It could s

I think calling it the "biggest reason" is wrong but not necessarily entirely wrong. There's a difference between Google's reasons and your benefit. It could simply mean the interests aligned. I get my credentials encrypted and Google gets more [insert stuff here]. When the interests don't align the result is a bit different. You could be sending tracking/location data every few minutes, adblockers could be crippled, you could be forced to sign in to sync Chrome data, etc. Usually the very same stuff Google relies on for revenue. So what I'm saying is that it's not that outlandish to assume Google had more reasons than your benefit.