It differentiates human-created content from AI-created content in a space where AI can’t perform competitively at all. So, just as with Crunchyroll, better to

It differentiates human-created content from AI-created content in a space where AI can’t perform competitively at all. So, just as with Crunchyroll, better to kill the complex human artistic subtitles so that people don’t get used to their boring “could be machine, could be human, who cares” slop (and, as a bonus, so that human moderators aren’t required to evaluate whether the subtitles are offensively shaped).