It peaked at 4.05% in March. The last 2 months it went just below 4% as the Unknown category increased. For June the reverse happened, so 4.04% seems to be the real current share of Linux on Desktop as desktop clients were read properly/werent spoofed.
There are many games & software with no Linux support, not to mention AC blocked games. Increased marketshare could change a thing or two, at least.