Where in the link does it talk about rolling the chain back?

Sure, but nodes have the ability to make certain transactions invalid if the operators dont want to store bullshit on their computers for eternity.

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Line 180 “If, however, some content appears in the chain that causes significant risks, we can fall back to the reactive method, which is a retroactive chain reorganization to invalidate the offending block (and any subsequent blocks) while immediately activating the new rules.”

This is the most retarded suggestion I have ever read. If you support this you are also retarded.

Ok i was uninformed. My b. I dont like the reactive approach but I dont see anything wrong with the proactive one.