I don't think this is the reason. I think the main reason was that many of those companies were invested in their own platforms, so most likely every new techno

I don't think this is the reason. I think the main reason was that many of those companies were invested in their own platforms, so most likely every new technology or project would be evaluated in terms of "how does it fit with our existing platform strategy". Even Nokia kept their Maemo tablets as a hobby project even though they were taken by surprise at their popularity.