Are you content with Amazon using its rights to prevent others from using theirs? They've done embrace-extend-extinguish to MIT software before, making everyone reliant on a proprietary version of the software.
Amazon easily has the market power to make their version of your software the default one. Other software will be written so it only works with the Amazon version, and that version will be proprietary and run only on their servers. I'm not really seeing how this increases freedom. They almost did this with both Redis and ElasticSearch. They did something similar to MySQL and Postgres, obsoleting them both with Amazon Aurora, but that hasn't run to its conclusion yet.