Ah yes, such obliviousness can be annoying. I don't mind it that much, although it's not my favorite trope, either.

As for downloading try these sites:

https://www.locoloader.com/bilibili-video-downloader/

https://www.videofk.com/

https://www.tubeoffline.com/download-BiliBili-videos.php

This is what I have in my bookmarks when it comes to downloading from bilibili. I hope one of them will work. As always addblocker is your friend. :)