Many of these titles are serialized as webcomics or independent doujinshi. If the creator is active on Pixiv Fanbox or Fantia , chapters are often released on a monthly subscription basis.
The "Strict Teacher" trope is currently seeing a massive resurgence in the eroge and doujin community. Fans are drawn to: genkaku cool na sensei ga aheboteochi updated
If you are following the series through unofficial translation groups, "updated" usually refers to a new English or localized chapter being uploaded to community hubs. Why This Title is Trending Many of these titles are serialized as webcomics