your Bitcoins are likely converted to fiat currency first, which is then used to purchase the item, rather than making the purchase directly with Bitcoin.
Bitcoin is money!
Almost daily I am purchasing goods at any of over 2,000 PicknPay stores, coffee at First Light Coffee in Jeffreysbay and petrol at TotalEnergies with WiCode vouchers from @bitrefill in #SouthAfrica.
Today I tested the new feature in nostr:npub1ajlrwgfj4yerhqf7ady03h7wmtk2qr3gs7h3sxcx83k05yld36sswpzx3q which allows you to directly pay the QR code from PicknPay. It worked! Thanks to the nostr:npub1jugar2agq6369p0l86razavs9shj2p6pscxecevs8j94ap37hkqsjlfc28 SDK that enables Lightning payments via swaps from nostr:npub1nyyhnqahf3cgqzcc927x7eqyd2msgplfe27ddn6hpgu2m200wh2s0s7gan 
Discussion
Yes, that happens to be true for PicknPay and petrol, but not for the coffeehouse owners. They accept BTC directly. It’s hard to onboard the big companies directly to Bitcoin, but this way it’s at least a start and people who earn or remit bitcoin can spend it without converting it to fiat first.
Yes, that's exactly what's happening in Vancouver. We now have a Bitcoin friendly Mayor who is good friends with Jeff Booth!
I read in one of the books on Bitcoin that some years backs several major companies started accepting Bitcoin, but only indirectly through fiat. However, they quietly phased it out within a couple of years due to declining interest and excessive volatility.