These filters are largely useless as is.
Take futa as example, it can mean there is just one Futa (which isn't even a LI) or a LI which is avoidable, or depending on your choice said LI is either a futa or female, or it could mean it's a full on futa game...
It's worse for ntr, when sometimes a single flashback is counted as ntr, even thought said girl is a ex and not a LI.
I remember the game Midlife Crisis, got the rape and gay tag a few years ago because some users kept whining about it.
That was just one scene, neither the MC nor any LI were involved (it was a punishment for a antagonist, and it was like 5 renders) and there was a 50% chance you'd never even see that scene...So if you look for gay/rape that is completely misleading and if you wanted to avoid games which focus on such content it was also missleading...
Good times