internet access stats: Android vs. Windows

How reliable is this statistics? Quite quick change for a very large number of devices.

Android vs. Windows vs. iOS vs. macOS in global internet usage: CHART - Business Insider

Report: Android overtakes Windows as the internet’s most used operating system | TechCrunch

"...mobile accounts for the vast majority of internet usage in countries like India (79 percent), Indonesia (72 percent) and China (57 percent), while desktop remains king in markets such as the U.S. (37 percent), U.K. (35 percent) and Germany (30 percent)."
Android overtakes Windows for first time | StatCounter Global Stats