Perhaps this technical approach is the wrong way entirely. In a scale free network it might seem like a good approach because of the seemingly infinite number of edges the hub nodes service (yt, twitter). The numbers are so large that you have a tendency to come up with a technical solution.
However a network can be laid out in a way that is more conducive to meaningful moderation. With meaningful in this case I am referring to there being people involved rather than algos. This requires having small world communities with influential core members or moderators.
This allows for a more inclusive/wider and more nuanced moderation. For example I assume that yt detects and removes CSAM, however it still has CSAM-like content because it is legal, but it would still be filtered otherwise. Likewise issues such as transphobia are not legal problems and thus are not properly moderated. On the flip end, stuff gets removed that has nothing wrong with it. When different communities create their own meaning through values and principles based on those values, we will have more diversity, and this allows for social progress in the long run.
This might be the case for the federated structure of Lemmy.
Of course this ignores communities that break off and do their own thing and polarize into a more extreme form. I feel that is a different problem that requires a different solution.
Excuse me for being all over the place with this post, but I have to run :)