To find backdoors?
> what is this signal fanboyism online when there are competing products doing the same thing?
You are completely misreading me. I actually prefer Element/Matrix than Signal (and I use both). But that does not matter one bit, so I hadn't mentioned it so far.
I'm a fanboy of nothing, that's not how I work. Take it easy.
> if whatsapp is using signal protocol then by effect isn't it as secure as signal?
WhatsApp is closed source. We only have Facebook's words for trusting it. Which is a bit weak if ask me.