I find that Privacyguides always has recommendations worth following: https://www.privacyguides.org/en/real-time-communication/ https://www.privacyguides.org/en

I find that Privacyguides always has recommendations worth following: https://www.privacyguides.org/en/real-time-communication/ https://www.privacyguides.org/en/real-time-communication/ Of these, https://simplex.chat/ https://simplex.chat/ seems the most promising, thanks to a level of decentralization.