Trivia: by default (unless it has changed upstream), the F-Droid app defaults to "Include anti-feature apps: Off" in the Settings. The user must go in there and manually opt-in to see all the anti-feature apps on the mobile client.
It doesn't actually hide apps with "anti-features", you can still see them by default. The only thing it does is hide the description and install button of apps with "anti-features" in the search screen. It seems like a half-baked feature.
Additionally, as you say, the F-droid repository does contain apps with those properties; they're labeled, not excluded.