You shouldn't have to hack it, you should have the right to repair the software on your device. Hopefully the Vizio lawsuit will help with that for Linux based devices, signs are looking good though.
This is just about GPL compliance though (afaik LG TVs are already GPL compliant, or at least, I haven't noticed any noncompliance).
The bigger problem here is tivoization. You can build a fresh kernel from source but you have no way to install it because the bootloader is locked down.
You're right, but until the laws change we should be telling everyone how and make these tools better. If we can't change the laws we can make the cat and mouse game too expensive for them to continue.
Plus, I'm pretty confident they are already doing illegal things. On my Samsung TV it wants to force update. There is no decline option, there is no option to turn off updates, only to take it completely offline. There's no way in hell these kinds of contracts would be legal in any other setting. There's no meaningful choice and contracts that strongarm one party are almost always illegal. You can't sign a contract where the bank can arbitrary change the loan on you (they can change interest but they can't arbitrarily charge how that interest is determined. Such as going from 1% to 1000% without some crazy impossible economic situation).
Someone needs to start a class action. Someone needs to push that as far as the courts will go