Why isnt free energy advancing?

In the field of free energy we have some people from time to time talking about it saying something like "they dont want it", we are preparing something, we are scared so we work in secret, we are nearly done building a device, we are very close of launching this free energy device... stuff like that happen, years pass and no device launched. Why does that happen? Because these people might have built something i don't doubt that but its not a finished product, ergo it cant be used practically.
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