Another problem is "resist fingerprinting" prevents some canvas processing, and many websites like bluesky, linked in or substack uses canvas to handle image upload, so your images appear to be stripes of pixel.
Then you have mobile apps that just don't run if you don't have a google account, like chatgpt's native app.
I understand why people give up, trying to fight for your privacy is an uphill battle with no end in sight.
Is that true? At least on iOS you can log into the ChatGPT with same email/password as the website.
I never use Google login for stuff and ChatGPT works fine for me.