Many games have "save points" that you must reach before you can safely save your progress and stop playing. If these "save points" are too far apart, this dark pattern can appear. Forcing players to continue playing longer than they want to, just so they can save their progress, is a waste of the player's time.
It should be noted that many classic games, such as Pac-Man or Super Mario Bros, could not be saved because the technology to do so had not been invented yet, so it's not fair to label these games with this dark pattern. Modern games that have the ability to save should not unreasonably prevent you from doing so. By preventing you from pausing gameplay they are forcing players to stay in the game longer than they would have otherwise, resulting in a negative experience for the player.
Most online multiplayer games can't be paused because it would affect the other players. This is understandable. However, these types of games should provide frequent opportunities for players to step out safely without causing negative repercussions. This is often accomplished by having timed matches, so you know what you are committing to when you enter the game.
Sometimes games combine this pattern with social pressure
to keep playing so you don't let down your teammates. This combination can create a unhealthy powerful drive to keep playing without breaks for long periods of time.