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As you pointed out, this isn't how Lightning Network works. The fact this is being upvoted is useful information about the state of this site and people's knee-jerk reaction to anything cryptocurrency related (coming from someone who has been here a while)

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Can you explain to me how something that is very unsatble in value can be useful as a currency?

Assuming all other aspects are solved.

The current volatility will decrease as adoption and everyday use increases.

The primary value of cryptocurrency is there not being a central authority to inflate away its value (through bailouts or economic 'stimulus').

Smart contracts offer the same fundamental value: you know what you are getting into and no one authority can change the terms on you.

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