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This is a joke, right?

Many of these so called "antiviruses" are malware themselves.

In case you really don't know, the "/s" stands for "the preceding text was meant sarcastically".

It's a reddit thing which is why it doesn't land here on HN as well.

I’m pretty sure it stands for “I was being sarcastic but my sarcasm wasn’t funny enough to read as sarcasm”.