Its 2019 and people still confuse the different kinds of "free" when talking about open source software.
(Also, yes, I open source as much of my work as possible, and I'm paid to write it)
Also, AWS is BUILT on open source, they just don't open source the extra bits they added on top. Just like how Microsoft took an open source tcp/ip stack and open source web browser, added some stuff, and called it their own.