It’s a whole lot easier to draw a still image with that much blood than it is to animate an entire fight scene with that much blood in it.

We could have as much blood as the comic but we would also have to wait much longer for the new seasons, and the show would cost significantly more so it would probably have only gottrn renewed for one season instead of two.

Not to mention that they would need extremely expensive state of the art PIXAR level graphics processors that the animation studio probably does not have access to or the money for.