It’s the privacy vs convenience problem. For most people, the convenience is so much more important so when you can just use Google to sign in everywhere, you get rid of your passwords remembering issue (oh my god how many people have blamed me for losing their passwords, I’m an IT guy).
Companies want to maximise profits by ‘knowing’ (ie tracking) their customers so they can tailor their products or services to actual usage. A noble goal? They just want to be more convenient for us.
In the end I guess having an account anywhere and the companies seeing anonimised or aggregated, no personally identifiable records, should not be an issue. But they don’t need to keep track of where I live, what my e-mail adress or phone number is and especially need not now any third party stuff.
It has become a very untrustworthy business just because the companies could do whatever they wanted and now that there is more scrutiny, they just find back alley ways to screw us over.
I’ve suggested password managers to loads of people who’d rather cling to updating their little pocketbooks where it’s impossible to distinguish between certain characters and password versions. The stubbornness of tech illiterates is stunning.