So how does this work legally - I bought a product with functionality X, and later the manufacturer can remove that functionality from me? What if that's the o

So how does this work legally - I bought a product with functionality X, and later the manufacturer can remove that functionality from me? What if that's the one and only functionality that I need - are they going to compensate me? Aren't they revising contract of sale after the money is paid? Could the manufacturer start charging me subsribtion for some functionality that was previously 'included'? What are the limits to how much could be taken back from me after I paid money for the goods? If I bought a car, and the manufacturer updated it to require a separate subscribtion for driving in each state, would that actually be illegal?