If you are just starting out, skip the 500GB pack. Find a small, verified set of 50 classic games, learn how MAME works, and upgrade later. The arcade will always be waiting.
While the MAME emulator itself is legal open-source software, the ROM files are copyrighted material belonging to the original manufacturers. Mame Roms Pack Download
A MAME ROMs pack download typically refers to a collection of MAME ROMs bundled together in a single package. These packs can range from a few dozen to thousands of games, depending on the specific collection. The process of downloading a MAME ROMs pack is relatively straightforward: users search for a reputable source, click on the download link, and wait for the files to be transferred to their device. If you are just starting out, skip the 500GB pack
Buy digital arcade compilations or support GOG, Steam, and Humble Bundle when they re-release classic arcade games. While the MAME emulator itself is legal open-source
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