You're asserting that they have forked OSS and then not provided back the source code for their own improvements.
I guess we can check their github repos to see if that's the case.
I guess we can check their github repos to see if that's the case.
On top of that AWS has done a lot of contributions upstream, particularly around the linux kernel, https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/lin..., (particularly the virtualisation stacks involved), some around OpenJDK at what looks like an increasing pace, and the like.
To be clear: not an AWS employee.