It used to be common for video games to have a set ending, or a point where there isn't anything else for players to accomplish. With the ever-increasing popularity of live service games, as well as DLC drops and the inclusion of fanmade mods, many games can now go on well past their pre-defined "end." Gamers are more concerned with getting the most out of their purchases and usually equate higher hours of playtime with a higher quality gaming experience overall.
Source:https://www.cbr.com/games-with-no-endings/