AWS of course is the single biggest reason why projects are flocking to more restrictive licenses. The right thing to do for AWS would have been to respect the work of the original authors (/company) and throw their weight behind an offering supported by the original developers. Instead, AWS builds a competing product when they see an OSS product succeeding. Third party vendors stand no chance after that due to the tighter integration and marketing muscle.
Not to mention, Amazon and AWS give so little back to Open Source despite being a big (the biggest?) beneficiary. Google, Microsoft and even Oracle do more for Open Source than Amazon.