If you visit Nintendo’s official site you might notice that they’ve begun adding in icons for games that require a Nintendo Switch Online membership to play online. There’s also a cloud save icon for those games that support that as well. Below is a screen capture of the Super Mario Party game page on Nintendo’s site:
This is a nice little added detail to give more information for those seeking it. Of course if every game would just support the cloud save functionality this would all be a moot point.