Many EU countries have limits on cash payments, and the EU will enforce a union-wide limit of 10,000€ in 2027. Of course, this limit won't be reevaluated over time, so the real value will decrease with inflation.

I'm just trying to imagine what kind of European vendor is willing to accept crypto for their car. The most obvious reasons seem a bit shady.

The use case would be for transactions between individuals. A friend working at a large industrial firm told me recently that crypto would solve a problem that they have in Asia: orders are often done during auctions from the producer, and require instant payments; however the payment rails take two weeks to clear a transaction. Crypto would fix this.

The fact that it's not widespread doesn't mean that there isn't a usecase.