There are robust alternatives available.
One such alternative is the Extensible Messaging and Presence Protocol, better known as XMPP, in combination with the Off-the-Record (OTR) plugin. XMPP is a widely used communication protocol with broad application across various message-oriented platforms. The OTR plugin further augments XMPP by adding layers of security and privacy.
The Off-the-Record plugin ensures your conversations are encrypted, safeguarding them from potential eavesdroppers. It also authenticates the participants in a conversation, thus assuring that your messages reach the intended recipient. Furthermore, OTR features perfect forward secrecy, which means your past conversations remain secure, even if your keys are compromised in the future. It also supports deniability, protecting your messages from being linked back to you.
https://wiki.xmpp.org/web/OTRhttps://otr.cypherpunks.ca/
XMPP/OTR doesn't require you to disclose a phone number, a feature that maintains your privacy. Moreover, it is platform-independent, supporting Apple, Android, and Windows alike. The ease of use of XMPP/OTR ensures you don't have to grapple with complex interfaces to ensure secure communication. If you need your own XMPP server, I'm happy to help out with bulledproof super secure whatever servers and idiot proof ready set up XMPP.