As we say in my home town, “Wankers!”. I need to have this WhatsApp BS as its the only way to stay connected with older relatives and work groups. I’m using RethinkDNS on my phone and have blocked as many Meta DNS and network links as I can find online. Exactly none of them show up on my firewall logs! The connections in/ out appear to be via “safe” routes, which if blocked then break wider functionality. To use yet another completely unheard of home town phrases, “Bastards”.
For Android:
Just my personal strategy. My firewall logs show its quite effective but not fully impervious.
Right now, for the wider population, it it a heaven sent option compared to Whatsapp, FB messenger etc. Break those bonds first and keep the wheel turning.