Also, the motivation seems to be a desire for building a bigger community which gives back its improvements. ZeroMQ for example sticks to LGPL for the very reas

Also, the motivation seems to be a desire for building a bigger community which gives back its improvements. ZeroMQ for example sticks to LGPL for the very reason - they believe that it is easier to build a community and discourage "dark forks" when software is licensed under GPL-like license. (See http://zeromq.org/area:faq#toc4 http://zeromq.org/area:faq#toc4).