What are some examples of once popular but later proven to be false or useless ideas that have existed as long as Bitcoin?
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I would not count DVDs and alike. These are specific technologies which were replaced by newer ones. The idea (storing information on a small physicalobject which you can carry etc) is still valid.
In a sense though, they are a bit like bitcoin. HD-DVD/Blu-ray was an improved alternative to DVDs much in the same way that Bitcoin is, some would say, an improved alternative to a bank ledger and transfer. Physical objects storing data didn't die, but the format did.