My group of (nerd) friends just migrated to matrix after Telegram started with their premium/crypto shenanigans and synthetic free-tier restrictions.
This new chat app is currently bait, but I'm not really lured by "threads", and the switch is a ticking timebomb.
Other red flags:
* Signup with phone number, other apps have proven that it's not universally necessary.
* Not mentioning that the author got equity of the app's company until halfway through the article.
* e2ee handwaving but there will never be proof unless they open-source it.
* Some integrated AI bot thing that nobody wants, could have been a bot API, stands at odds with e2ee, and just sounds like a lame attempt to ride the current wave.
* Mentions signal, whatsapp, telegram, but suspiciously not matrix.org, which AFAIK does have the touted feature to re-encrypt older messages to new members.