Found this wondering town

I didn't know my city was cool enough to put signal flyers.

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Or xss/sqli/etc attacks on vulnerable sites that don't sanitize url query parameters

Or maybe a fraudulent signal app.

I mean, generally speaking, just don't click on random links. This is a random link. Qr codes are valuable but we're conditioning society to just be cool with clicking on random shit without putting much thought into it.