Would you severely limit the time? If you don't, and you don't charge a fee, then the costs become insane.

You see, this isn't just a data connection. Somebody must be paid to observe the video, making sure that it isn't being used for crime. That person must understand the accent, slang, codewords, and everything else. That person must be trustworthy. That person won't be cheap.

Without an observer, prisoners will get up to all sorts of mischief. They will order witnesses and judges killed. They will continue to operate organized crime. They will pass along threats.