Re: [Trisquel-users] How to recognize non-free javascript

[Andrew M . Lindley]

The users of the proprietary version(s) have their freedoms stolen, 
so they are also affected.  Further any technical benefit that could 
be gained from the proprietary modifications is lost to the users of 
the free version unless someone is able to code a replacement.  In 
effect not putting free software under a copyleft license invites a 
Tragedy of the Commons[1].

[1] https://en.wikipedia.org/wiki/Tragedy_of_the_commons