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How do you know it hasn't been done already? (with a more silent payload than ransomware) /s

What does the /s mean in this context?

Not GP, but I think it indicates sarcasm?

/s is internet parlance to show that the message should be read in a sarcastic tone.

Yes, but what confused me is that as far as I can tell we really don’t know that it hasn’t been done before.