Opt-in keywords: why the pre-filled text matters
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Text-to-join campaigns live and die on exact keywords. The auto-responder on the other end is matching a string, and humans typing on a sidewalk produce variations: wrong casing that some systems tolerate, extra words that most don't, and autocorrect rewriting the keyword into a real word. Every variation is a lost signup that looks, from your side, like a poster nobody scanned.
A QR code removes the typing entirely. The keyword arrives verbatim, the number is right, and the person still makes the affirmative choice to tap send from their own phone. Pair the code with plain text on the poster saying what they're signing up for and roughly how often you'll text; people who know what to expect are the subscribers who stay.