LiefLayer: Not always. There are many Anime based on light novel (books) and visual novel (videogame).
And even anime original based on nothing else
Not true, while your writing does apply to the modern industrial entertainment complex (funny phrase but its true) it is unrelated to the stuff I am writing about. In case you didn't notice, I was writing about the foundations of why Anime became the way it is. I've even wrote.
"...I suggest that you should begin diving
into the history of early manga in order to understand
why anime is the way it is."
How can you misquote and rip out the entirety of the context of what I was typing?
It should be obvious that I am not talking about the early 80s or 70s when light novels became a thing, I don't exactly know when Visual Novels became one of the nowadays many pillars of the industrial entertainment complex but it could've been the 90s. I do suggest that you must read up on how the industry works in japan and how industrialized and normalized everything became to keep the wheels rolling.
Nowadays there are almost as many license holders then there are people making the entertainment and theres also many companies you've never heard about but are just as important as the companies in charge of a project, companies like IMAGICA and DR Movie. The industry almost works like an organism and is very intertwined, with thousands of people who work remotely and in different countries. Its very similar to the western AAA video game industry for sure but there are so many franchises in japan and license companies its impossible for an outsider who doesn't have much interest in these things anymore to keep track off. Its still an interesting subject, thats for sure.
Personally, I do believe that the herculean work of creativity is not done by the industry but the japanese indiegame market and many of the new mangaka that hold many creative ideas. There are even people who try to dive into this sort of philosophy (if you paid attention in the thread, you know exactly who I am talking about here). The indie gaming scene is really just as independent as indies in itch.io. Look up the topic of the bi-annual Comic Market, which is a seriously interesting topic even for the GOG-staffers. We really do need many more (more or less unknown) japanese indies on this platform apart from Visual Novels.
At any case, should you ever do any research about these topics then you're in for a suprise thats for sure.