Oh, the memories seeing those names bring back.
So happy to have been there for the through the 90's.
If ever there were a textbook example of apples/oranges, this would be it.
The example is helpful, though. In each of those cases something very much better came along to replace it.
The same thing could very well happen with BitCoin. Someone mentioned forking BitCoin and tweaking the algorithm to remove the artificial ceiling of 21 million units, and replace it with an algorithm which monitors all the transactions taking pace and adjusts monetary policy in response to them, in order to produce a steady inflation rate. Such a currency might very well be more desirable than one with deflationary tendencies.
Bottom line - unless someone figures out a way to replace BitCoin with something better, I see no reason to believe BitCoin is going away anytime soon.
Those were all companies which sold at a billion dollars or many billions of dollars and have sense been shut down or are worth a tiny fraction of that amount today.
And those are just examples from the last 20 years, we could go back to nearly countless examples of other speculative bubbles going back centuries.