Doesn't tell us anything because the picture you use in OP consists of several data points while the picture in this post only consists of two data points and a flattened curve. You better stop posting nonsense or learn to interpret the incomplete data you are providing.
Only if you are using the data available rather than cherry picking short windows that suite your agenda.It's easily a large enough % of the playerbase to measure trends off of though.
Dismissing steam charts is folly - they are a good indication of the current trends, because those trends are likely to be reflected on other platforms.