While the primary legal target is the website operator, users are not entirely exempt from risk.

Go to Settings > My Fire TV > About and click your device name seven times to unlock Developer Options.

To get a streaming app on your Amazon Fire TV Stick, you must "sideload" it:

The primary revenue stream for piracy sites is advertising. Piracy apps often contain aggressive adware that displays pop-ups even when the app is not in use. Some variants include spyware that tracks user browsing habits to sell to third parties.