The Deal with Receipts in Taiwan: Why They Give One for Everything (and Why You Should Care)
https://highstylife.com/wearing-daisy-dukes-to-a-temple-a-travelers-guide-to-what-not-to-say-do-or-wear-in-taiwan/
Cut to the chase: in Taiwan, receipts are everywhere. You buy a bottle of water, you get a receipt. You buy a subway token (well, you probably use an EasyCard), you might get a receipt. Your receipt is also a lottery ticket