For people who don’t have Photos or a Google account, you’ll still have the option to share an album with them using a link. You can enable and disable link sharing as you wish, and Google gives you the option to decide whether other people can contribute content. When you remove someone from an album, any photos and videos they added to it will disappear as well. 

As before, Google says the new functionality isn’t designed to replace the chat apps you already use. However, it hopes the feature will improve “sharing memories with your friends and family in Google Photos.” The company says it will roll out direct album sharing to all users over the next week. As usual, sometimes these things can take some time, so be patient if Photos still defaults to link sharing.