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I don't get it. Sorry.

I mean that the word "blockchain" instantly adds 50% in your stock value ;)

I wouldn't go as far as writing anything. You're right to be skeptical though. I haven't seen or heard any major reasons these are a good idea. Everything that's listed exists elsewhere in better forms, so some of these ideas aren't solving any new problem, or solving an existing problem better. A good reason to be skeptical.