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I think selling time can definitely be considered as unethical. However what scares me most is people using this to do DDoS or other network-related attacks. Because of JS' performance, from a pure performance point of view, it is currently much more economical to spin off a couple EC2 instances, but that may indeed change in the future.

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Luckily JS in the browser does not have the ability to make arbitrary network connections (at least not yet).

Well JS can make GET and POST requests to arbitrary URLs, that is often enough for a DDoS.

It does, HTTP at least. That could be enough to DDoS even a large site.

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