> Iirc, a 2018 stackoverflow survey of what devs use had 50% on windows, 40% on Linux and 10% on mac.

You needn't rely on your memory, the survey is still available [0]. FWIW, it doesn't seem to contain a question about the OS where development takes place, only about the targets[1]. The top answers were:

Linux 48.3%

Windows Desktop or Server 35.4%

Android 29.0%

AWS 24.1%

Mac OS 17.9%

[0] https://insights.stackoverflow.com/survey/2018/

[1] "Linux and Windows Desktop or Server are the most common choices that our respondents say they have done development work for this year." (emphasis mine)