What are the "popular" alternatives? Telegram stores everything, WhatsApp doesn't allow usernames, Matrix requires IPs too...
Signal doesn't collect IPs and therefore can't even hand them out. It's been requested in 2021. Here's a list of requests from authorities they were allowed to publish. I've looked through 3 of the most recent and nowhere do they reveal IPs.
What are the "popular" alternatives? Telegram stores everything, WhatsApp doesn't allow usernames, Matrix requires IPs too...