some Avs are weird.. whydo they categorize miners as "hackertools" or "riskyware"?
Risk tool generally means legitimately published software that isn't malicious but that the average computer user probably doesn't want, and that might be there for a malicious purpose if the user doesn't know about it. Legitimate FTP servers, proxy servers, remote access software, and such fall in this category too, same with those "spy on your spouse" keylogging/screenshot grabbing sort of programs as well. Given that definition, a bitcoin miner would definitely fit.
Other names for the same thing include PUP (potentially unwanted program).