I don't understand why obsolete technologies by MS are often upvoted on HN and become the first replies, while the corresponding working, decentralized technologies go to the bottom. Matrix exists and has a preliminary P2P version [0,1]. Other messengers were also mentioned in the comments here. Another example of such tendency is here: [2].

[0] https://arewep2pyet.com/

[1] https://news.ycombinator.com/item?id=23393935

[2] https://news.ycombinator.com/item?id=44898242#44898884