some thoughts:

as a product, Miku as modern-era folklore is designed to sell for her parent company. her purpose is to literally make money for a company that owns notable portions of her identity (voice, technically most of her designs, some commercial rights).

but also, Miku has been used in so many different environments (the video talks about this) with her reach containing so little influence to her parent company that she could be argued to be "owned" by the people. most practical uses of Miku are free to use (or not enforced copyright-wise) and that's one of the main reasons she's applied in so many different ways.

compared to corporations like say Disney that also create characters to sell - but hold significant sway on what the characters are and what they mean - they can and have historically been used as a system of oppression (eg. Cold War propaganda), but Miku and other community-run franchises (eg. Touhou) are very much aligned with communism.

yeah i'm gonna shut up now