Bitrefill is a centralised third party. It's not using Bitcoin and it's also not censorship resistant.
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
They are a service provider and deliver on the possibility to spend BTC with merchants who otherwise don’t accept it. They don’t need to be censorship resistant. If you use Bitcoin only, you can spare the hassle to exchange BTC to fiat first. So many ppl are talking about the „Bitcoin standard“ and hyperbitcoinization… well if everyone is just hoarding (and most on exchanges!) that won’t happen.