> It's the opposite, actually: the original copyleft licenses such as the GPL were explicitly designed to promote Open Source by hindering adoption in some case

> It's the opposite, actually: the original copyleft licenses such as the GPL were explicitly designed to promote Open Source by hindering adoption in some cases, namely those where companies want to distribute derivative works commercially. I'm usually not the one to defend GPL but I want to point out that AFAIK distributing derivative works commercially is totally fine for GPL - you just have to follow the rules in the license (provide source code under the same licence).