You have to be able to convey business value to get approval on anything corporate deems “extra”
At the end of the day, the project manager is going to have to be able to “prove” that color blind settings will translate to $$$ to the people above them, and not only that, but reliably more $$$ than it will cost to implement.
Which means first you need to know how much money it actually is likely to make, and we have actually very little data on what % of gamers that enjoy (genre) are colorblind.
So you’re already off to a pretty dang rough start.
Usually you only actually get these features when the CEO themself has buy in, like, “Oh yeah my cousin is colorblind and told me how much games suck about it, so make sure we include that feature”
Thats pretty much the only way you’ll be seeing that sort of inclusivity, when you have direct buy in to the movement of inclusivity coming from the very top at a company culture level.