How would you come to that conclusion?
Most people making the negative comments would not have a clue and likely killed many fish themselves.
Tanked is made for TV viewing otherwise the general public would not watch it, so Most of the tank set ups are planned months in advance and you don't see really how long it actual has taken to set these tanks up .
Some of these tanks have massive water volume with little fish so cycling these tanks will not be an issue.
In general taking fish from the reefs could be seen as not the right thing to do as many fish are killed, but we still have fish tanks.
i would say most of the tanks would have someone doing the maintenance as they are not budget tanks where cash is not a problem.