Downvotes
As someone else mentioned, it's because it's a very low value comment.
It provides nothing to the discussion except a bad attitude.
It's clear from the fact you're asking it you don't about the topic. Go investigate Cosmic desktop, if you don't know why we should care about it, and you can find out for yourself whether or not it's worth caring about.
If you find out that you don't think this is something that should be discussed, don't up vote the thread and move on, simple as that. If the thread gets many upvotes anyways, you can infer people care about it, even if you don't. Comments like this only pollute the discussion and make everything feel negative.
It's a big part of the reason the internet has become such a drag, that people always feel the need to comment every little thing, even if it only adds negative value.