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The “Bro visited his friend” meme template. In panel one, a character says “hi GOG any new deals tod-” and another character, labeled with the GOG.com logo, replies with the screenshot of a mail header titled “Slavic adventures 𖥞 ꥟ ϟϟ”. In the second panel, the first character looks at the second one with a worried look on their face.
Yeah … that’s the real smoking gun, though. That’s what tips it past being ‘possibly an accident’ and into ‘GOG needs to find and fire their Nazi communications staff member’. (And in either case, they really should be issuing a very public apology.)