Probably none, sorry. If you wanted to pirate something on Android, you would have to either download a closed-source piracy app, which you can only hope doesn't have any malicious code inside, or download unverified .apk files from random websites, also a bad idea.
Fire OS, the operating system on Fire sticks, is essentially Android with Amazon's stuff on top of it. If there is an app that enables piracy on it, I wouldn't trust it.