I would add SimpleX, Session, Threema, and Signal. Telegram sucks, and while I love the stickers, it sucks.
As the other person said, Stremio is torrenting, which puts your IP address on as billboard. Don’t do it without a VPN or running it through Tor or I2P.
I would add every Proton/Tuta product as an alternative to one of the 3000 Google products, like Gmail and Drive.
However, I will ALWAYS recommend privacyguides.org ;3
No encryption by default (you have to start a secret chat to have end-to-end encrypted communication).
No encryption for group chats and there is no option for secret group chats.
They store all your chat history on their server and have the keys to decrypt it at any time.
They have a pretty shitty support, if you need to report a bug or something, you can't easily do that.
They have a broken testing process for new features, may be pushed to streamline without making sure those work properly. I don't use it as my main communication app but even with rare occasions - the app crashes way too often.