I just checked their Pixiv, apparently it's a thing with them and what they do.
this has to be fetish art, artist claims to be a 27 yo japanese woman from saga perfecture and every single one of her art features characters dying of strangling, while every one of the comments on pixiv is cheering on the artist to produce more. her twitter seems to has been suspended and a brief glimpse of users sharing her art to twitter as well as twitter's algorithm recommendations of similar accounts does not give me hope that they won't act on their fetish in real life.