Depends on the type of illicit software. Things like cracks, aimbots, cheats, and anything else designed to modify the behavior of another program, *do* in fact act like viruses. The antivirus can’t possibly know that you want that behavior, it just sees a program that tries to mess with another program.
Another reason might be the lack of trustworthy digital signatures, which illicit softwares obviously don’t have. That makes the AV usually more “suspicious” of a program in the first place.
And finally, how do you know that there are *really* no viruses in that software? After all, the grey market is the perfect place to distribute malware.
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