I mean, I wouldn’t expect to have custom Linux ROMs for an iPad. For an Android device, which is already Linux based, that would make sense. But it wouldn’t surprise me if the newer iPads had builds for them since they’re built on the same processor as the MacBooks

What could you not install Linux on? I’ve never had that issue.

It depends on the chipset. The big changes in chipset have been the big barriers for Mac upgradability. My father ran a 10 year old MacBook that was still running the latest MacOS until he found that his 4GB of RAM wasn’t going to be enough and bought a new one (without talking to me first). I had a PPC MacBook that ran on the latest MacOS for about 6 years after Apple switched to Intel.

They don’t, actually. They only sell anonymized statistics and don’t allow advertisers to choose who they advertise to. As a result, they can’t charge as much for advertising. So they are actively taking less money to better protect your information in that respect.