At the start of April there were the Steam Survey results for March 2023 that showed a 0.54% dip to the marketshare. With that were als some strange shifts in the Windows 10 vs. 11 marketshare as well as a big boost to the Chinese marketshare. The March numbers were not revised but with the start of May comes the April numbers… Showing a boost to Linux and largely recovering from the April anomaly…

Source: Phoronix – After A Strange March, Valve’s April Numbers Show Steam Linux Numbers Appearing Inline