That's a political statement. The position is that one should have the right and ability to communicate with other people in a secure fashion. If you deny this right, and build structures to monitor all communication, when "bad" people take over the government, you end up in a dystopia. Then building any sort of anti-government political movement become very difficult because they can hear whatever you say.

So I am glad that software like Signal/Whatsapp exist that allow secure communication [1]. And I would take the harms causes by them being unmonitored rather than the harm of future dystopian governments. Due to how crypto works, I don't think there is much middle ground here.

[1] I would prefer open source, more community owned platforms take over than these two.

Sorry but you were arguing that Discord should snoop even more into what we're doing for ethical reasons, and now you're saying privacy is a virtue. Do you have a reason to think Discord doesn't already do these things and just doesn't get it right every time?

Phone and email aren't more private than Discord either. Arguably less. Difficult to get a phone these days without buying it on camera. And a phone company will give up all your messages.

There are two competing principles here: (1) Privacy for individuals (from government and non-government entities), and (2) generally do things in a way that minimize crime. Both are good, and generally I want communication platforms to conform to (1) rather than (2).

Whatsapp/Signal are as close to (1) as possible by design, can't actually do (2) at all. Phone/Mail are somewhere in the middle, but quite close to (1). In most countries in the world, there is no mass recording of phone calls or mail, despite it trivially easy to do so. Moreover, due to long long historical legal precedent, I don't think phone/mail companies have any freedom to do things differently. They are pretty much constrained to do exactly what the government tells them to do.

Discord on the other hand, does not respect (1) at all. In fact, it very intentionally records and reads everything for profit. And it hands over any info requested by law enforcement. So, ethically, either they rewrite Discord to respect (1) or they should do (2). I don't think they are. As others have noted in this thread, it is trivial to find servers that are clearly criminal.

One might argue that it is impossible to do so because there are so many servers. My second political position is that if your public platform is so large that you can't effectively moderate it, that is not an excuse. You are culpable. Simply stop your platform from growing past the point where you can't effectively stop bad things happening. You don't have the right to profit while enabling bad things.