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I've seen venues with long lines to buy tickets where they put a sign with a shortlink to buy online and skip a line.

Long links are not convenient when people have to type them into devices with no physical keyboard.

Hasen't this use case been replaced by QR code use a decade ago already?

If the link is too long, the generated QR code will be difficult to recognize.

There may be a need to change the links after printing, and this is where the advantages come into play