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First of all, no. Global, trustless coordination is a hard problem and is not necessarily illegal. Second, legality is subjective around the world. It is currently illegal in the US to gamble online, for some reason, even though casinos and lotteries are a thing. It is illegal in many countries to transfer a certain amount of money out of the country, for some reason. Certain sexualities are illegal in quite a few countries. Illegal != bad |
I'm saying: you need the blockchain if and only if you are doing things that are illegal in your country. It's a decision criteria for when you need the blockchain.
I'm making no moral judgement. And there are very good reasons to want to do things that your government deems illegal (for example, donating to a political organization that has been blacklisted)