It used a Laserdisc, the CED needle in a groove system would have probably worn out the media probably faster than the game's random access of scenes worse out the mechanics of the Pioneer players, which while industrial models didn't quite envision the extremes of games. E.g. probably more for teaching people how to repair stuff.

Wikipedia devotes quite a bit to the problems in keeping the games running: https://en.wikipedia.org/wiki/Dragon's_Lair e.g.:

"The life of the original player's gas laser was about 650 hours; although later models had solid state lasers with an estimated life of 50,000 hours, the spindle motor typically failed long before that."