Looks like people have been able to see footage from other people's cameras today, apparently due to a server upgrade issue.

https://9to5mac.com/2021/05/17/huge-eufy-privacy-breach/

Statement from Eufy: https://communitysecurity.eufylife.com/t/statement-from-eufy-security/1181099

EDIT: It is recommended you reconnect all devices and log out/in again.