Windows has taken a significant drop over the years, going from being used by over 90% of people to being dropped down to under 60%
(thelemmy.club)
Since it's just a share of total usage, that doesn't necessarily mean that people switched.
There were a lot of layoffs in 2023, and big companies tend to use Windows as their enterprise desktop. So a drop in Windows users at the enterprise level would necessitate that other OSs now have a larger share of the remaining pie.