Operating systems that contain free / libre software provide freedoms that operating systems with proprietary software do not.
According to the GNU Free Software Philosophy, a program is free software if the users have the four essential freedoms.
The GNU General Public License (GNU GPL), and other Free Licenses that are compatible with the GNU GPL, give you and protect the following four freedoms:
Freedom 0: The freedom to run the program as you wish, for any purpose.
Freedom 1: The freedom to study how the program works, and change it so it does your computing as you wish. Access to the source code is a precondition for this.
Freedom 2: The freedom to redistribute copies so you can help others.
Freedom 3: The freedom to distribute copies of your modified versions to others. By doing this you can give the whole community a chance to benefit from your changes. Access to the source code is a precondition for this.
The reason they are numbered 0, 1, 2 and 3 is historical. Around 1990 there were three freedoms, numbered 1, 2 and 3. Then we realized that the freedom to run the program needed to be mentioned explicitly. It was clearly more basic than the other three, so it properly should precede them. Rather than renumber the others, we made it freedom 0.
The licenses for proprietary operating systems go against the four essential freedoms of free / libre software.
macOS® License
If you utilize macOS®, you must accept a Apple Software License Agreement.
Read Sections 2A, 2J, 2K and 2L of the Apple Software License Agreements for macOS Ventura, exclusively for Apple computers.
These licenses have restrictions that violate all the freedoms of the GNU Free Software Philosophy. For this and other reasons, I do not use macOS®.
Windows® License
If you utilize Windows®, you must accept a Microsoft License Agreement.
Read Sections 2a, 2c(ii), 2c(iii), 2c(iv) and 2c(vi) of the Microsoft Software License Terms – Windows Operating System (OEM) to utilize Windows preinstalled in a computer that you may have acquired.
Read Sections 2a, 2c(ii), 2c(iii), 2c(iv) and 2c(vi) of the Microsoft Software License Terms – Windows Operating System (Retail) to utilize Windows if you purchased the operating system separately from your computer.
These licenses have restrictions that violate all the freedoms of the GNU Free Software Philosophy. For this and other reasons, I do not use Windows®.
Only GNU is Free Software
Only Free Software, based on the GNU Operating System (GNU’s Not Unix) guarantees your freedoms.
Software must be distributed under one of the Free Licenses to be considered free.
The GNU/Linux-libre distributions are the only ones that completely respect the four essential freedoms of the users. Trisquel GNU/Linux is a user-friendly distribution of the GNU Operating System, with the Linux-libre Kernel.
There are other Linux distributions that are also available, but are not endorsed by the Free Software Foundation. Nevertheless, they have drivers and multimedia codecs needed for a more user friendly user experience. Those Linux distributions use the Linux Kernel.
You can read about the major Linux distributions in DistroWatch and in Kernel.org.
Libre Software | GNU+Linux 