It shouldn't take them that long to detect the API access this tool uses to generate free developer certificates if they really cared.
That may start an arms race that'll inevitably be too costly for Apple to continue, but after the initial blow I expect many people to drop the platform all together, giving Apple a one-time quick win.
It doesn’t create a free dev certificate, it uses the same tools as anyone downloading XCode, writing a program and installing on their phone would, it is a completely Apple-certified workflow automated to do the resigning every week.
I know it's certified and automated, but that doesn't stop Apple from detecting and blocking it somehow. There is a certificate process that's crucial to install the app onto the device and that gives Apple the control it may need to make the apps un-installable for at least a little while.
That may start an arms race that'll inevitably be too costly for Apple to continue, but after the initial blow I expect many people to drop the platform all together, giving Apple a one-time quick win.