They want more data and literally can't store it efficiently enough. You can read their eula and see, they instantly own anything you upload and you no longer have rights to it, which is absolutely bonkers and pretty dubious in many countries if this is even legal. We found out when they overviewed the security of our studio and we use other communication software now because of it. They could literally argue that they own the assets to the games we make if we send concepts to each other.