There is also a Hangul adaptation of Gilbert called Gilbeot [1]. It also has an interesting feature that censors words that discriminate LGBT people (akin to Sans Bullshit Sans). I do have a feeling that they are clearly decorative and yet still being overused for non-heading text, maybe this is a major problem with many color fonts.
In fact, its design choice is questionable even as a title font. Normally the text color will be chosen so that it has enough contrast compared to the background. With color fonts you can't always change the text color, but you can still change the background. Gilbert however contains all hues in a single glyph, so some part of each glyph is always going to be hard to distinguish from the background without much care.
That is a beautiful font. Is it distributed in the same format as what's discussed in the material.io post (COLRv1)? It's still a good example of what's possible; I'm just curious.
[1] https://rainbowfoundation.co.kr/gilbeot