Depends on who you ask. In a literal sense, no. But lots of people use "FAANG" as a shorthand for a wide range of established tech companies with relatively high compensation (and RSUs with actual value). In that sense, yes.
I think its less about size but more about paying ridiculous salary bands. Netflix does that, but to my knowledge Microsoft is still at "body shop" pay levels.
No amazon pays very well with RSUs. Much higher than Microsoft for equivalent titles. However, I don't know if people get 'upleveled' at Microsoft. Could be that a Senior Software Engineer at Amazon would be a Principal Engineer at microsoft or something.