In all fairness VGC is mostly about UNIT sales, and not generated revenue tracking. Unit sales can be considered a pretty decent metric and same goes for revenue/active user numbers as well. The best is to combine these and try to see the whole picture.
Not taking into account unit sales will result in just as skewed overall market understanding as the one you are complaining about.
OT: it was expected and it seems to be the natural direction that MS takes as of late. They want to offer the services as a one-size-fits-all aproach. Luckily, it seems that as of next gen they will be able to sweeten the deal with some good exclusives as well.
I come to VGChartz for gaming news and curious for gaming figures, however lets be honest here, these so called figures that some come here for turn what is suppose to be a meaningless stat and turn it into a major flaw with a product and do nothing but downplay products that are not number one on the sales charts. I look at the industry as a whole, I never cared the PS3 was the least selling system for most of last gen, I never cared the WiiU was the least selling console this gen and I surely don't care the X1 is the least selling console now.
I know how businesses are run and some need to move past basic barbaric sales numbers and need to start looking at the bigger picture. Its all about the money and this gen money is sourced from many types or avenues not just physical hardware sales like in the past.
As for these services, this is where MS see the money, not how many consoles they sell. In fact its these type of services like GamePass and Play Anywhere that diminish there very own physical game sales and it seems that doesn't bother MS at all, so its clear that MS (A company that knows how to make money) are heading in this direction. Weather its successful next gen will wait and see, as for this gen it seems to be working for them.