Can't MangaDex sense when those apps are being used and force a page reload to the index page of that manga?
Even in the early days of torrenting, multiple fake torrent sites were created and run in other foreign countries which basically duplicated sites such as BoxTorrents (BakaBT). Those sites didn't charge, but had lots of advertisement banners and affiliate links. To make things annoying, they took bandwidth from the sites they were emulating such as linking to objects, the tracker, and of course the description pages and reviews for each torrent. Those sites also affected seeders by stealing their bandwidth as the torrents were multi-tracker. BoxTorrents of course did a few tricks that made it harder for those for-profit sites to also steal the seeders in the cloud.