I can somehow agree with a few things you say, but overall I think the premise is wrong. The fact is not that most blocks or even half the blocks are due to having illegal or bad content. I also don't know any defederation based on language or any such matter (especially since languages seen is already solved by your profile selection of language). Most blocks are automated, especially for instances that have trouble handling bot sign-ups, or those that have moderation issues. I think that the assumptions that one can make are indeed dangerous but they're not based in reality, but in imaginary facts about what defederation means. Obviously, since we're growing very fast, I agree that newcomers and less technically minded people may believe this is the case and use blocklists to justify random assumptions. But in the end, they would be entirely wrong, and wrong assumptions can be made about practically anything, so I wouldn't put much value or thought into the possible wraponizationability of instance defederation lists.