macOS has been on a downward trend since Apple started pushing "Services", basically iCloud. Now it's as bad as Windows when I last used Windows.
It's not just privacy violations. Those are the tip of the iceberg. I used to open the Activity Monitor and see a couple pages of processes. Now it's in the hundreds.
It's stuff that was badly done even before AI. The industry has been drunk on SaaS for way too long, and with SaaS comes the junk/slop and the privacy violations.
I've been doing my part and cancelling all my subscriptions apart from power, water, internet and garbage.
I won't disagree that MacOS has been getting worse, but Windows is even worse than you remember it. It's clearly a race to the bottom, but Windows 11 is full of ads, and you can't even search the Start menu for your installed programs anymore. MacOS hasn't gotten that bad yet, as frustrating as the new "Apps" menu is.
I switched my desktop to Ubuntu about a year ago, and while it's not 100% free of trouble, I still can't imagine running Windows 11 again. My MBP still runs MacOS and I haven't been pushed far enough to want to try installing a Linux distro on it.