With e2ee you don’t send unencrypted data to the server. Even if you connected to the entirely wrong server they still wouldn’t get your photos.
I’m talking about using native apps not websites as the client.
Sure, but your claim about not trusting the server, whether using native apps or websites, remain false, because you must establish a connection and handshake to begin with and cannot eliminate trust from the equation.
Yeah, there’s trust for reliability, metadata, and probably other things. But you’re not trusting the server to not look at your files, because it can’t.