Intel has already made a move to rework their GPU development by effectively starting over(see: recruiting Raja Koduri to work in the same kind of leadership position he had at AMD previously while developing Vega). But they need a stopgap for the coming years, and this is one way to attack.
The Vega M package is a technically interesting product(size, integration, possible economies of scale), but it's primarily a win for market share because Intel can cram it down the throat of OEMs to stop them from using Nvidia. They would happily cut their margins to do so.
Let hope they do.
But yes, even still, Kaby-G is a very expensive part. I've heard ballpark like $500-600 for just the package. You can pretty much buy a whole Ryzen 2500U laptop for just that one item on the BOM. But it's also much faster - roughly 4x as fast as a 2500U.
Let say AMD makes a profit on their Vega Chip sold to Intel.
Intel will now have to sell this CPU+Vega chip ( Raw Cost ) @ Intel Margin.
So Intel either sell a very expensive package, or sell it at the same cost ( or slightly higher ) to customer as if they were to buy them separately, which hurts Intel margin. ( Because Intel earn less on Vega )
And it has been a long time Intel dont care about margin at all.