Fair, but a lot of new users might also get discouraged if the first thing they see is content from exploding-heads or hexbear, and the instances that strive to be safe, inclusive spaces and thus do a significant amount of defederating are usually quite forthright about this when you sign up. For example, I knew just what to expect when I joined beehaw.
The instance I’m posting from now tries to keep things inclusive more via moderation vs. defederation. There are pros and cons to each approach. I can see both perspective.
I just don’t think either approach harms the fediverse. I think that’s a bit melodramatic.