Earlier quoted context omitted.
Crunchyroll strangely lacks Japanese subs, which seems strange as Netflix, Amazon Prime, and most others have them in addition to all the translations.
Japanese people as a whole never watch content with proper subtitles. And the subtitles that do exist in Japan for Japanese content are universally awful. It seems only foreign companies that promote being accessible have them. Unext, a Japanese company, never offers subs on Japanese content. It only have subtitles for foreign content... but it only offers subtitles if you're not watching Japanese dubs. It never, und…
This is standard in closed captions and is not specific to Japan. So perhaps the service you're talking about only has closed captions and is incorrectly marking them as subtitles.