This question was inspired by my hatred of Temporal Anti-Aliasing which, in many games nowadays, is poorly used as a performance bandaid. On lower resolutions it will smudge and blur the image and certain bad cases of TAA will cause visible ghosting.
Yet in spite of all this, certain games won't let you turn it off or have hair/fur/foliage look like dogshit without it so sometimes I still use it.
Almost anything Google. I have an Android because I hate the restrictions of iOS, but forcing me to sell my location to Google if I want to know where I am (even in an open source app because location is a system thing).
If you don't want that, you should look into microG. It replaces Google Play Services with an open source reimplementation, so apps that use it and stuff like location still work but without actually talking to Google. If an app uses Google Maps, it will instead use OpenStreetMap, for example. There's a version of LineageOS, which ships without Google stuff and instead with microG and F-Droid as well.
Look into custom ROMs, there's a few degoogled privacy focused ROMs but support depends on ur mobile. You can also degoogle it yourself but can be quite time consuming.
GrapheneOS! The catch is you need to buy a google pixel.