You seem to have got it wrong

I read about Dell and Tesla allegedly accepting bitcoins as back as a few years ago, but it turned out that it was some obscure company which had been reselling their goods for bitcoins. It's small wonder that these manufacturers continued to accept only fiat, and the company which accepted bitcoins was actually converting them to fiat and thus had been earning on currency exchange operations. You could just as well convert your Bitcoin stash to fiat yourself and buy what you need directly