Recent intrusive changes in the privacy policy of WhatsApp (including the sharing of never before seen amounts of unencrypted user data with the parent company Facebook) have prompted a mass exodus of WhatsApp users to the secure and open-source alternative Signal. I have been hoping for a change like this for years. I wrote a non-technical blog post about the problems with WhatsApp in detail, comparing the advantages and disadvantages of other messaging apps as well.
The article is okay, but it could use some images or a comparison matrix. Apart from what @dessalines@lemmy.ml posted, I made a comparison like this (in German) here: https://wiki.tilde.fun/de/guide/messenger/start
Sadly it misses a few things and I didn’t translate it (yet). But the point is that there’s more messengers than Telegram and Signal as alternative to WhatsApp, most notably the already mentioned Element.io.