These are all attempts to scale bitcoin, but none of them is definitive yet. Will there ever be one?
It's more like ecash is a tool for bitcoiners to use. It lets bitcoiners do things they can't do with bitcoin (currently, maybe this changes) but it doesn't really scale bitcoin. It doesn't allow more people to use bitcoin because it's not bitcoin. But it still may be useful.
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We are so early!
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