

Immutability just means the system files can’t be edited easily. Basically every time you update you’re updating the entire OS all at once. Which is a good way to keep things stable while also modern!
Unless there’s an application not available via Appimage or Flatpak (“app store”), most users will never even come up against the immutability aspect.

They pretty much just remove you from all those different people finder websites. Not the data brokers that Meta (etc) sell to/from.
It’s still beneficial if you can afford it, but more likely to protect you from targeted scams or stalkers etc. than anything Big Tech.