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It's a joke: if it really was clear that a railgun was "the way to go," companies would be doing it.

I haven't estimated building costs yet. Several billion could be in the ballpark though.

Serious issue with rail guns is the acceleration. Might be suitable for cargo lift, but accelerate a human quickly enough and it squishes rather unpleasantly.

Efficient market hypothesis.

It's apparently not hard to raise several billion dollars if you're trying to sell pet food online, create an app that dispatches taxis, or post extremely short messages on a web site.

>It's apparently not hard to raise several billion dollars if you're trying to sell something that makes hundreds of billions of dollars

Sorry, when did sell online pet food retailing, taxi dispatching apps, or instant messaging apps, come close to making anywhere near "hundreds of billions of dollars"

https://en.wikipedia.org/wiki/Going_concern