Adding to the chorus: if you need to apply a solution like this, it's probably time to walk away from the platform. (Well, the right time to walk away would have been years ago, but...)
I was actually thinking of making a similar app for hacker news comments. Should we all quit hacker news too?
Network effects are stronger than we are. People are there because people are there.
All remotely popular online public spaces are completely infiltrated by bots/propagandists/trolls/morons/etc. If you could successfully filter that type of content out you'd end up with a much larger pool of valid/authentic content to access than if you abandoned the space altogether and switched to some very obscure/niche space that's yet to be manipulated.