It is not aout throwing the right to implement things away. As long as it is done according to the license of the works modified or copied, one can do that. What this is against is, that people wash away a license, that is meant to keep things open, transparent and free. It enables businesses to go back to completely proprietary systems, which will impact your rights.

I am for keeping the licenses in place, as long as there is any copyright at all on software. If we get rid of that, then we can get rid of copyleft licenses and all others too. But of course businesses and greedy people want to have their cake and eat it too. They want copyleft to disappear, but _their_ software, oh no, no one may copy that! Double standards at their best.