Sky cites piracy as the reason for disabling developer mode.Ever since the launch of the first Now TV box for just 10 in 2013, some buyers have been using the little streaming pucks in ways Sky hadn't originally intended. Cut through the branding, and Now TV boxes are just Rokus in disguise, complete with a developer mode that lets users sideload apps not available in the sparse Now TV store. But no longer, as Sky has quietly begun issuing an update to Now TV boxes that disables developer mode and purges any apps that've been installed on them using the loophole.Not many Roku apps can be found neatly packaged for sideloading, and you can only maintain one shoehorned app on the boxes at any one time. It's no surprise, then, that a niche community has developed almost exclusively around filling that one slot with Plex. For starters, the official Plex Classic client is easily found online, and the powerful media centre software adds a plethora of otherwise absent functionality to the Now TV boxes.As a post on the Now TV support forum explains: "The latest update has been designed to safeguard the device from piracy and illegal streaming of content; therefore it will disable the use of unofficial third party software or apps."I've pressed Sky to elaborate, including asking for examples of illegal activity in which developer mode was accomplice. At time of writing, I haven't heard anything more than the above, illogical explanation. As far as I know, Plex is the only sensible use for the lone sideload slot, and I've kept a lazy eye on the community ever since I penned a guide on how to turn the first Now TV box into a Plex machine. The software is both popular and available in the Roku app store, and it's probably worth mentioning at this point that Sky is a significant investor in Roku. It just doesn't add up.So, if the piracy line is a PR exercise, what's the real motive behind killing developer mode and the adjoined community? Doing this, it would seem, needlessly alienates part of the Now TV customer base. I suspect -- and this is just spitballing, mind -- that Sky simply doesn't want to encourage the Plex crowd to buy Now TV hardware any longer. The primary purpose of the boxes has always been to push Sky's paid content, and I believe they are sold at a loss -- the second-gen Now TV puck sells for just 15, yet it's based on the Roku 3, which launched in the UK for 99.It's understandable that Sky would prefer buyers to have a genuine interest in purchasing complimentary content passes, not those in the market for a cheap-as-chips Plex machine. Sky has never advertised developer mode as a feature, and of course, the company is perfectly entitled to disable it, even if does come across as a tad anti-consumer given some people have bought Now TV boxes purely to take advantage of sideloading.But business is business, not piracy.Update 2: It would appear the trickery below doesn't successfully disable automatic updates, so there's no way to stop it reaching Now TV boxes barring taking them offline altogether.