Consumer burnable CD and DVD disks often have an astonishingly short storage life, especially if they are not stored very carefully. They’re not an archival medium. Competently pressed commercial (aluminum) disks meanwhile have a storage life that is near as makes no difference to infinite provided they are not physically damaged in some way.

I’ve got tons of burned disks of pirated old games from the early aughts that don’t read anymore. This is highly annoying from a preservation standpoint as I can’t get them to play despite possessing them on disk, and they’re now unpopular enough that they’re likewise difficult to impossible to pirate again.