If you buy a brand new computer, virtually all of them come with Windows or Mac pre installed. For the overwhelming majority of users, they are satisfied with either of these options, and can do everything that they want to do with a computer on these operating systems. The overwhelming majority of users aren't willing to go through the effort of mounting a Linux distro onto a USB, navigating through the BIOS to launch the OS' installer, partitioning their drive to avoid deleting all of their data accidentally, reinstalling and setting up all of their programs again, and learning how to use an entirely new operating system just because "Linux is free, FOSS, and gives you more freedom". The only times Linux has seen widespread adoption is when it comes bundled with specific hardware already, such as with the Steam Deck or Chromebooks