And whatsapp? When are they "forced" to provide a simple and stable in time interop protocol stack ? (with reuse of irc,smtp,noscript/basic (x)html/etc?) This

And whatsapp? When are they "forced" to provide a simple and stable in time interop protocol stack ? (with reuse of irc,smtp,noscript/basic (x)html/etc?) This one is not better than the other.