As I am a big proponent of open source, there is nothing wrong even with copying code - the point is that you should not be allowed to claim something as your own idea and definitely not to claim copyright on code that was “inspired” by someone else’s work. The easiest solution would be to forbid patents on software (and patents altogether) completely. The only purpose that FOSS licenses have is to prevent corporations from monetizing the work under the license.
again, I don’t have a problem with copying code - but I as a developer know whether I took enough of someone else’s algorithm so that I should mention the original authorship :) My only problem with circumventing licenses is when people put more restrictive licenses on plagiarized code.
And - I guess - in conclusion, if someone makes a license too free, so that putting a restrictive (commercial) license or patent on plagiarized / derived work, that is also something I don’t want to see.