SELinux on Android

Yes, there has been no mass jamming so far. But:

1) people playing with RF devices are a small minority;

2) it's very easy to underestimate the impact to others. When there's a problem and you shoot yourself in the foot, well you'll definitely notice it and then fix the problem. When you create a problem only for others it's a very different situation: it's easy to overlook. More so because the other people suffering from the issue typically won't understand the root cause or be able to trace the issue to its cause. They'll usually blame their device or network, and move along. This create a strong bias toward underestimating the created issues.

Because of the later, my recommendation to people playing with radio systems: have fun (I certainly can understand the interest ;), but please please be cautious for others. Try to be paranoid on what could go wrong before moving to the field.

An example: the SDR systems typically have no RF filtering, because there is no configurable filters of sufficient performance (yet). Without filter a device will create a lot of interference in surrounding frequencies and possibly jam other, unrelated systems. Not a problem in the lab at very low power, but you want to have proper filtering in the field.