Some game have &quot;lost&quot; ownership. Say that old game studio that developed GameBoy game has gone bankrupt, no one is going to enforce the copyright<p>Most game or not reedited so there is no money to gain fom preventing them from being online. It may even help to keep the brand alive in case a reboot in programmed (Eg: tomb raider)<p>Often it&#x27;s a simple calculation of how much revenue could be won if you factor in the fact that you need to pay the team to find the ROM&#x27;s, send the letters and enforce them once in a while. Basically it&#x27;s nearly never worth it.