The truth is that it become a race to the bottom with a lot of open source projects, specially the ones that are not hard to replicate.
If the author made the project GPL, someone else would create a similar library with a more permissive license, which would end up taking the market and making the original library irrelevant.
If the author made the project GPL, someone else would create a similar library with a more permissive license, which would end up taking the market and making the original library irrelevant.