Older disk games are the least sustainable due to the requirement of materials for the disks, pc games can be even worse for this as when the pc gets older if the parts get replaced it can stop the user from playing the game at all due to drivers or operating system changes. More advance DRM (anti-piracy software) started using codes which gave the copy limited uses and meant that the user would need to buy a new copy if they wanted to reinstall it. Later the codes were replaced with online verification this however brings about new issues along with online games which require servers to be running in order to access the software this means that once the software stops getting supported or the servers get turnt off no one will be able to play them anymore without modifications removing the limitations and DRM.
PC’s are machines that have advanced tremendously in the past decades however this means that they require upgrading and changing more often along with needing more power to function and more materials for the components as they increase in size and capability