Not every QR code is a link. This one encodes whatever you type, character for character — no prefix added, no formatting applied. Scanners simply hand the text back. It is what you want for identifiers, machine-readable settings and anything that is not meant to open a website.
No. Because it is not a URL, most scanners just display the text. Note that many phone cameras act automatically on links but stay quiet on plain text — you may need to tap to see it. That is the scanner behaving normally, not a fault in the code.
Technically a few thousand characters, but long text makes a dense grid of tiny squares. If the code will be printed, keep it short and print it larger — density is the usual reason a printed code will not scan.
Yes, it is encoded verbatim, punctuation included. Whether the app reading it accepts that format is up to that app — the code carries exactly what you typed.
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