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.
That's not true, I use ChatGPT's app on my phone without logging into a Google account.
You don't even need any kind of account at all to use it.
An android phone asks you to link a google account when you use it for the first time. It takes a very dedicated user to refuse that, then to avoid logging in into the gmail, youtube or app store apps which will all also link your phone to your google account when you sign in.
But I do actively avoid this, I use Aurora, F-droid, K9 and NewPipeX, so no link to google.
But then no ChatGPT app. When I start it, I get hit with a logging page to the app store and it's game over.
In the end, the fact remain: no chatgpt app without giving up your privacy, to google none the less.
Of course as Google doesn't claim they do this, many people would consider it unreasonably fearful/cynical.