Fyi, most of them have not been cracked, but bypassed using a hypervisor that operates in ring-1, so it is certainly a security risk..
Personally I've been voting with my wallet and *never* supporting DRM, so there have been some games where I'm just "Well, I guess I'll never play that game." At least I have an ethical option to play certain games now, I'm just gonna use a seperate blank pc cus these bypasses are novel.
Cracking refers to all methods of circumventing copy protection. Bypassing is just another way of cracking something.
All software piracy is a security risk since they could embed malware in the game.