You may be running nonfree programs on your computer every day without realizing it—through your web browser.
In the free software community, the idea that any nonfree program mistreats its users is familiar. Some of us defend our freedom by rejecting all proprietary software on our computers. Many others recognize nonfreeness as a strike against the program.
In addition to being nonfree, many of these programs are malware because they snoop on the user. Even nastier, some sites use services which record all the user's actions while looking at the page. The services supposedly “redact” the recordings to exclude some sensitive data that the web site shouldn't get. But even if that works reliably, the whole purpose of these services is to give the web site other personal data that it shouldn't get.