Nice. I dunno if there even is such a thing as trackers for STL files, I do know some places where you can find files from specific topics like warhammer minis and so on; but other than that I wouldn't know where to find such a thing
Plant sensing is well established scientific fact, but that's not all. Experiments show they can learn from experience and remember things. Their intelligence is mostly hormonal so their reaction times is about 1 or 2 orders of magnitude lower than animals. Information processing happens in their system of root apexes, so that's their "brain"
No, they wouldn't. The law aims at making it compulsory for companies to add that backdoor, private individuals can still run whatever software they want, they can't stop you from running a not-for-profit app from some independent developer that doesn't relay on servers.
I'm no expert but 1 in 50 donors doesn't even seem too bad