IMAPs is just IMAP on TLS, so it does not have anything to do with e2ee in this context.
If you use GnuPG or one of the GUI implementations it does.
You do realize e2ee merely means that two users share public keys when they communicate in order to decrypt the messages they receive, right?
*DAV clients expect cleartext data on the server. If you encrypt the data, you need to build all this logic into the clients, and you are not following the standard anymore, which means you will anyway be bound to your client only (and those which implement compatibility).
You’re talking about people paying for cloud services that manage everything for them. Nothing to stop you from hosting your own on an encrypted drive. EteSync does E2E already, and there is already a plethora of apps supporting PGP on Android and Desktop to encrypt/decrypt messages.
If you use GnuPG or one of the GUI implementations it does.
You do realize e2ee merely means that two users share public keys when they communicate in order to decrypt the messages they receive, right?
You’re talking about people paying for cloud services that manage everything for them. Nothing to stop you from hosting your own on an encrypted drive. EteSync does E2E already, and there is already a plethora of apps supporting PGP on Android and Desktop to encrypt/decrypt messages.