Fair points.

But if you use the same bitcoin address for every email, you won't know who the mark that actually paid was -- potentially leaving money on the table for the future.

I did (before posting the comment to which you replied) check to see if there was any activity[0] on the bitcoin address in the email I posted. There was none. Which strengthened my conclusion (I have no evidence) that unique bitcoin addresses were in use.

But I certainly could be wrong.

[0] https://www.blockchain.com/explorer/addresses/btc/bc1qt30ya4...