The coffee receipts I can understand - if a shop uses Square or a similar tablet-based POS system, I could see requesting an emailed receipt, typing in the wron

The coffee receipts I can understand - if a shop uses Square or a similar tablet-based POS system, I could see requesting an emailed receipt, typing in the wrong email address, and then not noticing when it never arrived. Some of those systems link your email address to your payment method, so if you just hit "email receipt" every time, without double-checking and catching the typo, you (the wrong recipient) will just keep getting them.