A few platforms offer legal, DRM-free arcade-style games that work in MAME. Examples include the Itch.io “MAME compatible” tag or the Internet Archive ’s small collection of legally cleared titles (but verify each).
Many classic arcade games are available legally through: Full Set Mame Roms Download
Always ensure the ROM set version matches your MAME executable version. Using 0.220 ROMs on MAME 0.264 will result in "Missing Files" errors. A few platforms offer legal, DRM-free arcade-style games
When downloading MAME ROMs, follow best practices: A few platforms offer legal