Large "3200 game" bundles are frequently hosted on unofficial sites and can contain malware, adware, or outdated ROM sets that won't actually boot on newer versions of MAME. The "Working" Label:

These packs are frequently stuffed with redundant game clones (clones of the same game from different regions) or massive files you will never play, wasting your hard drive space. 🕹️ The Better, Safer Alternative

Cracked software often comes with no guarantees of safety. It may include malware or viruses designed to exploit users.