LOL you never heard about using Lightning Network ?
Read more:

• https://darthcoin.substack.com/p/bitcoin-and-privacy
• https://darthcoin.substack.com/p/lightning-cleaning-machine
• https://darth-coin.github.io/beginner/getting-started-lightning-en.html
• https://darthcoin.substack.com/p/operating-with-ln-as-a-merchant
• https://darth-coin.github.io/beginner/be-your-own-bank-en.html

How you pay with Bitcoin with privacy?

Here is how you pay using BTC LN
and
https://darthcoin.substack.com/p/bitcoin-lightning-irl-examples