With Windows 7 in its support coffin, some institutions are finally giving up on Windows entirely. The biggest of these may be the South Korean government. In May 2019, South Korea's Interior Ministry announced plans to look into switching to the Linux desktop from Windows. It must have liked what it saw. According to the Korean news site Newsis, the South Korean Ministry of Strategy and Planning has announced the government is exploring moving most of its approximately 3.3 million Windows computers to Linux.
The reason for this is simple. It's to reduce software licensing costs and the government's reliance on Windows. As Choi Jang-hyuk, the head of the Ministry of Strategy and Finance, said, "We will resolve our dependency on a single company while reducing the budget by introducing an open-source operating system."
How much? South Korean officials said it would cost 780 billion won (about $655 million) to move government PCs from Windows 7 to Windows 10.
Another reason might be if you don't trust the government of Windows country of origin.
There have been stories of big moves from Windows to Linux for years. No really big ones ever seem to actually happen.