Keypad backlights

Looking for reviews, vidos, or better shortly what kind of backlights are on gaming keyboards. Only full-color ones are interesting.

Is it realistic to set a separate color for each button, set a picture?
How many images fit in memory, let's say in cheap ones. Is it realistic to drive your own there and again how much?
Support for animation, custom animation?

Now it seems to me that there are only a few modes and that's it. It seems like there are very cool keyboards, but the reviewers do not talk about the possibilities of backlighting, more often they all mention something unnecessary that is in all other devices of this type.

Who had any requirements for illumination or did they all care and are needed only for a wow effect upon purchase?

I went to this forum like a popular old site, I just don’t know others, but I don’t know any other gaming forums with at least some kind of online.
The backlight with animation and brightness control is interesting with low gluttony, but for some reason there is no software needed