That's very curious. The push to WhatsApp is especially interesting considering it is owned by Meta/Facebook, which is a company that has a long history of working with the US government for extrajudicial surveillance of the US populace. I wonder if they're working with the Indian government in a similar capacity.
As such, I fully personally expect WhatsApp to have officially sanctioned government backdoors. If they're willing to build them for the US government, maybe they're building them for the Indian government, too. Which is perhaps why there is a push towards the corporate, non-open solution, because the other options have more ways for individuals to avoid backdoors.
We really need more community owned and operated communications groups, like the barbed wire telephone of the past.