Monthly Steam hardware survey analysis

[Bofferbrauer2]

I wonder what's up at Steam, looking at the January 2019 GPU charts at the DX distribution:

DirectX 8 GPUs and below: 0.93% | 0.98% | 1.21% | 1.56% | 1.90% | +0.34%

How come those age-old GPUs are constantly getting a larger market share month ofter month despite being out of sale for almost 15 years now.