Many Anime and Cartoon adaptions don't sell enough to warrant major investment. Some may be popular enough to sell pretty well with above average investment, but like say a Trigun game or something with a major budget, which the license alone is money, or a major budget for a Scooby-Doo game.
Do you see such games selling 5-8 million units? no.
Dragon Ball needed years and a lot of circumstances for the sales of Xenoverse 2 and Fighter Z to reach where they are, but neither are exactly in the AAA range you're thinking of. Media, new show, movies, new manga, new merch, off-screen stuff, events etc. etc. were needed, as well as lower than regular retail prce for the typical game, and these are A AA titles.
A slow burn game would be a disaster with a AAA budget, as it may sell well enough eventually, but you'd lose a crap ton of money upfront and have to deal with new marketing and price cuts, just like with what happened to Street Fighter V, which for years was doomed to fail, until circumstances led to a new wave of consumers going back and buying it post 2018.
Generally for even modest games to do well based off anime adaptions, the name has to be a major draw. Naruto used to have to not so much now, but Dragon Ball has it, Yugioh also has it but the concept of the series makes it very hard to justify a AAA game.
You'd actually have a better bet adapting from movies for those high sales, Live action have proven to be big hti adaptions, so have comics, and certain book series, an Anime adaption from a movie would likely have a better chance of getting a AAA budget and doing well, than from what I see implied in your posts(s) from a TV series.