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Scams suck. If you're a dev on a chat platform, and you're seeing a pile of them, I can recommend a little project! Get yourself some free time on a service (Cloudflare workers will do). Find a pHashing library for your language of choice.

Scan all images and compare hashes to a list of known scam images. Use Hamming distance of around 4 or so to survive JPG compression. Warn/ban/mute/whatever folks who post those images.