https://www.theregister.co.uk/2019/02/27/windows_10_usage/

Windows 10 1809 continued its sinister seep from beneath the basement door last month as usage crested the 20 per cent mark.

This is according to ad slingers AdDuplex, though the figures have to be taken with a pinch of salt since, as the outfit cheerfully admits, the data hailed from around 5,000 Windows Store apps running the company's SDK. Or about 100,000 PCs.