Despite the legalisms that may or not may be relevant, and despite being Amazon or any big company. I could bet a decent amount that AWS legal department does

Despite the legalisms that may or not may be relevant, and despite being Amazon or any big company. I could bet a decent amount that AWS legal department does not even know this was forked from OSS. This is probably some dev or PM who found out about the project and decided they were in-line for a promotion using someone else's work.