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Michał "rysiek" Woźniak · 🇺🇦

- images usually get downloaded automatically (and thus get cached on Cloudflare side)

- push notifications make this a 0-click thing, as the targeted user doesn't even have to click on a conversation to have the image downloaded

I believe this technique would work against any communication app that uses any global CDN that does endpoint caching and provides the caching status in HTTP headers of the response.