I’m gay
I don’t think the people raising this as a concern are trying to solve the problem of bigots on the internet; they are just asking for you to change the advertising you provide to remove the bigots from a place of visibility.
And if the racist is here to cause problems rather than commiserate with fellow racists, they now know exactly which community to avoid, thus restoring moderation problems everywhere. I don’t think anyone is asking you to moderate every instance to ensure they are sticking to your TOS or your viewpoints, but it’s a very minor ask to not showcase off the racists and transphobes and bigots on the ‘join this platform’ page.
I’m not here to proselytize about what we decide to block or not. I’m explaining what the person above is requesting - not a block, but a conscious decision about what shows up on the join-lemmy list.