Alternative Frontends of Reddit,X and Youtube aren't being blocked in parental control section.

Hello NextDNS team,

I'm a NextDNS user, and I'd like to suggest a feature that I think would help many people who use Parental Control and the service blocks.

The problem: when I block a service such as X (Twitter), Reddit or YouTube, only the official domains are blocked. Unofficial alternative frontends, such as Nitter for X, Redlib, Libreddit and Teddit for Reddit, and Invidious and Piped for YouTube, keep working because they are hosted on completely different domains. Some of these sites show the full text of posts and comments, so blocking the official service doesn't actually stop access to its content. 

What I'm proposing, in order of preference:

1. Include known alternative frontends in the existing service definitions, so that blocking Reddit, X or YouTube also blocks the frontends for that service.

2. Or add a separate Parental Control category or toggle called something like "Alternative frontends and mirrors".

3. Or at the very least, provide a maintained list that users can add to their denylist.

Several of these projects publish their own instance lists in machine-readable form, for example the Invidious instance API and the Redlib instances repository on GitHub, so keeping a list current could be largely automated.

Thank you.