One major difference is it's hard to "supe up" an old computer. Harder in general for the layman to repair or modify means you are more likely to need a fully functioning device to be able to use it, less gray area. Also cars are inherently harder to store so there are less of them floating around at any given time if they aren't immediately serviceable they might get junked or otherwise rust into pieces.

That being said writing software for "dead" platforms might level that out