This is the opposite, the big companies closed their messaging platforms because they wanted to shed low performing departments and consolidate, instead of maintaining them and keep attempting to make them florish which would be a form of diversification.

Right. And the analogy also fails because buying Apple shares is as easy as selling them; what makes the destruction of all the original IM platforms so dumb is that it's a one-way move. Once you shut one down, there's no Ctrl-Z.