The OnStar is an obvious example. But how does voiding the warranty restrict your ability to drive where you want? It's the vendor simply saying "you're doing

The OnStar is an obvious example. But how does voiding the warranty restrict your ability to drive where you want? It's the vendor simply saying "you're doing something we did not intend you to do with the product, so it's on you if you fuck up". How does that infringe on your freedom to drive where you want?