I don't see how that would be a much different problem to now. If I put goatse in this comment, others can see it. Then mods will remove it. If it were on IPF

I don't see how that would be a much different problem to now. If I put goatse in this comment, others can see it. Then mods will remove it. If it were on IPFS, the same would happen except the old version may still be accessible if people are still distributing it. You'd only come across it if you were deliberately looking at an older version.