Did chatgpt write this?

I'm not sure what exactly you mean by "always active desktop sessions" but for any definition I could imagine it is possible to do that while having e2ee. Many e2ee messengers have multi-device support nowadays.

Telegram doesn't need to have e2ee because they've pulled some trick of becoming widely perceived as being privacy friendly despite not actually offering any e2ee in most cases, and offering only some 🤡-protocol in the few cases where they do.

Another reason for them not to implement e2ee is that they're most likely monetizing their users content data as well as the metadata (and in more ways than just charging some types of police for access to it, which is presumably only a small fraction of their revenue).

E2ee doesn't have to be 2 devices. It can be for any amount of endpoints as long as they have the key to decrypt the data.

For example my nextcloud instance has e2ee for my phone, computer, and tablet.

They say that they don't, and I think it is extremely likely that Signal employees are entirely sincere when they say that.

But, even if they truly don't keep metadata, they can't actually know what their hosting provider (Amazon) is doing. And, their cryptographic "sealed sender" thing doesn't really solve the problem. If someone with the right access at Amazon really wants the Signal metadata, they can get it, and if they can, anybody who can coerce, compel, or otherwise compromise those people (or their computers) can get it too.

One can say they're confident that the kind of adversaries they care to protect against don't have that kind of capability, but it isn't reasonable to say that Signal's no-logging policy protects metadata without adding the caveat that routing all the traffic through Amazon makes the metadata of the protocol's entire userbase available in a single place for the kind of adversaries that do.