It happened because people figured out putting the whole synopsis in the title on the main LN/WN site in Japan gave them more clicks and then everyone started doing it.
It’s basically the same as YouTubers having to put their face in thumbnails to get clicks.
Pay attention to your email, when cloudflare decides to warn you for this (they will, it’s very very much against TOS) they’ll send you an email, if you don’t remove the tunnel ASAP, your entire account will be terminated.