"Saturated", as in the first usage under "Web", refers to market saturation. The word is questionably appropriate in the first case, and wrong in the second.
I suspect that what he means (in both cases), is that sales are low on both platforms, and they are not worth the effort to port to.
Good question. From context, maybe they meant "diverse"?
That was my read too, though I haven’t seen the term used that way before.
I think the word they were looking for is "fragmented".