Curious if any pirate companies ever bothered to try MD's add-ons. Without copy protection the Sega CD entry barrier would be low, but you have the problem of relatively few users... It wasn't a smash hit in regions where commercial pirates are most active. On top of there being not many CD burners available back then. Similarly I don't recall 3DO, PC-FX, or other earlier insecure CD systems getting fake copies mass produced either.