/e/OS is highly insecure, and Murena tries to sell privacy to customers, while offering an unencrypted cloud service, that honestly isn't any better than mainsteam solutions like Google Drive, OneDrive or whatever.
At this point, you're better off getting an iPad, and using iCloud with the Advanced Data protection program.
If you actually want a secure, privacy-friendly and degoogled tablet, get a (preferably used) Google Pixel tablet, and install GrapheneOS on it. It's not just the most secure mobile OS out there, but it also doesn't come with any integrated cloud nonsense, so you're free to choose which service you want to use and whom you want to trust with your data.