[mtrovo]

Would your answer be the same if this encrypted data was stored in China instead of US?

I don't think messages should ever leave the device, if you want to migrate to a different device this could be covered by that user flow directly. Maybe you want to sync media like photos or videos shared on a group chat and I'm fine with that compromise but I see more risks than benefits on backing up messages on the cloud, no matter if it's encrypted or not.

[r3trohack3r]

I think the average human will disagree with you. They want to preserve their data and aren't technically competent and organized enough to maintain their own backups with locally hosted hardware. Even the technically literate encourage _offsite_ backups of your data.

Know your threat model and what actions your trying to defend against.

Typical humans need trusted vendors that put in actual effort to make themselves blind to your personal data.