What is the source of this?

The attrition is slow, but every user lost to Linux is likely lost forever. After a year or so of totally free software, who is going to build a new windows compatible PC, buy a Windows 11 license, and pay for subscription service just to do word processing, or play a few incompatible games?

Windows completely overestimates people’s willingness to throw out their laptop or PC just to get a new OS paintjob. For every person who does it, another one will leave their ecosystem forever.