New Breed of Replication Receiver Clouds

There is an ever increasing number of data protection providers creating replication receiver clouds as they team up with cloud service providers. This could herald the end of on premise tape use for some enterprises, leaving tape to be used primarily by cloud providers. There are major benefits for Quantum, Zerto, Veeam, and others to form replication receiver clouds, but these clouds are not just or storage anymore. They could be purely for storage, but this is not a big win for the cloud service providers. So why would cloud service providers be interested in being a storage endpoint for data protection? Why are they concerned with backup and offering it as a service?