Previously, they had the site view.matrix.org, which showed matrix rooms that were visible to users who hadn't joined them (an opt-in setting determined by the room admins).

The Github repository for view.matrix.org is archived, and the description says it is being replaced by archive.matrix.org. But the new site is also archiving rooms where the admins have set it to be visible only to members. So, even if you have explicitly set your room to be not publicly scrapable, they will still attempt to scrape your room.

Why have an option to make a room not publicly scrapable if you're just going to make a bot scrape everything anyways😠