Yeah like the other replies said, it's meant to be part of a link shortener; or maybe you have a short domain that you can use short urls with. Like surprisingly enough I could fit a link to my github page in there as plaintext (although all caps)
[0] https://github.com/kochrt/qr-designer/commit/55d4de3f856828b... [1] https://robko.ch/qr-designer/