The chair analogy is a bit weird, because I am actually free to buy a chair, disassemble it and somehow use it as a table if my needs for a table for some weird reason happens to coincide with the form factor of the chair. I don't think the analogy really works, but if a chair worked as a modern phone then it would be built with one-way screws and in general be built to lose structural integrity if you try to disassemble it.
A better analogy is roads. Anyone can put any car on the public roads (they may be breaking the law if the car is not legal). But we are moving towards a world where the roads will slash the tires of any car which isn't approved by Ford or Tesla. Ford and Tesla didn't build the roads, but they somehow took over the control of them.
A better comparison is buying a chair where the seller gets to aprove who sits and when.
Increasingly, so is the government, because freedom of computing is incompatible with surveillance, age verification etc.