I would agree with you if Tesla gave me a contract stating I can’t do anything with the OS of the car and sell my first born son because I’m licensing it.Sure. Tesla could prevent it and you could make a purchase decision based on app installation freedom.
Yup.
This would be fine also.
You can do whatever you want with your goods, the manufacturer does t have to support you. For example, if you want to replace your Samsung qled with an oled, Samsung doesn’t support it, but you could certainly attempt it.
Because one doesnt purchase software. You could do what you want with Tesla operating system, but Tesla doesn’t have to support you.
It’s not your platform, don’t buy it if you dont like the limitations. Or you could buy the device and hope the government regulates such that one wouldn’t even recognize what it was.
But only if this contract is signed and agreed to before ownership is transferred. If this contract is presented afterwards it’s still in EU not legally binding.
Just like when you purchase a house, after you give the money to the real estate agent/ owner you must sign the dotted line before money is transferred.
If you after purchasing the house finds a new licensing agreement with a sticker blocking your use of the toilet stating: by breaking this seal you agree to the licensing agreement.
And it states you must only use signed and agreed toilet paper/ toothbrushes/ toothpaste etc containing a special chip that unlocks the tap, shower and toilet functions etc. any third party products will not be allowed to work and will void any warranty products might have.
And if you think it’s far fetched it’s not impossible in theory to do this with printing paper.

If you thought printer cartridge DRM was bad, Dymo is forcing users to buy RFID paper
Printer manufacturer Dymo is facing backlash after it debuted new label printers that feature digital rights management embedded in their paper.
appleinsider.com
This is a fundamentally illegal( or rather unenforceable) as it violates private property laws and contract laws in EU at least.