I believe they do, unless their studio is 100% owned by Microsoft, but I don’t really know
Exactly, that limitation has to be bypassed, otherwise the marketplace is WAY behind in updates compared to the third parties websites or pirate websites, which causes people not to buy in the marketplace.
That limitation has to be removed, the marketplace needs to become way more agile and allow 3rd party developers to quickly and directly update their products, just like steam does.