You make it sound so evil while the fact is that the store is for a lot more secure and sandboxed apps so you can't just put any kind in the store. The reason why they let their own apps in like office is because they are ok for guaranteeing for their own products while they do not want to discriminate other app developers among themselves on who can and who can't put an unsecure app into the store
In theory. In practise, the store was, and is, full of shit. Junk apps, because MS paid people to push apps out. Junk apps and scams, because MS does no review or policing. Even Netflix had to go to MS 3 times in order for them to block fake Netflix apps. Other companies selling well-known programs have told me they simply cannot get MS to respond.
Search for "Game of Thrones" right now on the Windows Store. Or WinRAR. Microsoft doesn't even verify their "publishers" are actual companies, have valid URLs for the store listing (most of these junk apps just go to "http://"). It's been and remains a joke.