A Microsoft file hosting and synchronization service.
I think it's big tech's effort to condition people into combining their daily life in to Microsoft products. It psychologically tries to link the "Memories" of users with the Microsoft suite of products. This creates a loyal and dependent consumer. It is also trashy and manipulative.
Microsoft provides a service, and if it's useful the consumer will pay for it. They don't own anyone's life.
Stop the social engineering, and do your job, Microsoft.