Here's how a tweak from Cydia generates money for the developer by consuming your resources without you knowing

  Enable WebGL is a tweak presented a long time ago in Cydia and its role is, apparently, to activate WebGL technology in the Safari browser of our iDevices. What the developer does not say in the description of the tweak is that it loads advertising banners in the background once every 5 minutes, automatically generating money for it. IN A detailed article published during the night, a developer describes the entire procedure used to generate money without the users knowing, and the worst part is that the system used in tweak affects both the performance of the iDevice, as well as the autonomy or the data traffic available in the subscription.

There are several iframes, including a now-defunct news link. The advertising links appear to commonly use "Nobitazzz" and "felixcat" as the affiliate key, which pretty much rules out the possibility this is a compromised innocent site Finishing up the HTML, there are several more affiliate iframes and JavaScript to refresh the page every five minutes. Regular background refreshes could keep your CPU awake, be taxing on your battery, plus slowly and silently wear down on your data plan.

  Unfortunately the tweak can't be modified to remove everything the developer introduced, but whoever discovered the problem wrote a better script. Unfortunately, these are the risks of using jailbreak solutions, but the good part is that we are only talking about loading web pages and nothing more. Unfortunately, iOS becomes as vulnerable as Android after the removal of the restrictions imposed by the Apple company and you must be extremely careful what you install in the terminals after performing a jailbreak.