You are free to build and run your own apps on your devices with whatever code you desire. Now, talking about MY devices, I don't think you should run whatever

You are free to build and run your own apps on your devices with whatever code you desire. Now, talking about MY devices, I don't think you should run whatever you want. That's why I like that there is someone making sure that whatever I run on my device from a 3rd party is safe. If you have an iPhone, what anti-virus are you using? Exactly.