Amazon says it is ending sideloading on new Fire Sticks because "apps that facilitate piracy, and other apps, can carry malware," adding that there is "a good amount of evidence" that sideloaded apps may contain unwanted code or behavior. However, the company did not provide specific examples of Fire Stick users being harmed. Ars Technica reports: Amazon has released two Fire Stick models that use its proprietary, Linux-based operating system, Vega OS. Previous Fire Sticks ran Fire OS, which is an Android fork based on the Android Open Source Project. One of the biggest differences between Vega OS and Fire OS is that the former doesn't support sideloading. [...] In a recent interview, Or Goren, editor-in-chief of Cord Busters, a UK-based streaming news outlet, noted the negative reaction to Vega being a closed OS. [Aidan Marcuss, VP of Fire TV, advertising, and Appstore] responded, per the publication, by saying that Vega OS was Amazon's opportunity to "innovate and deliver more capabilities, even on the least expensive devices."

He also said that making a platform around security and privacy was "sort of utmost in my mind." The statement is somewhat ironic, considering Vega OS blocks custom launchers and other third-party apps that helped users avoid Amazon tracking and ads. Goren asked whether Amazon had evidence that sideloaded devices caused users harm. "Apps that facilitate piracy, and other apps, can carry malware," Marcuss responded. Marcuss also said that there is "a good amount of evidence that apps can carry unwanted code and behavior on them when they're sideloaded."

Marcuss didn't provide specific examples of Fire Stick users being hurt by sideloaded apps. There are some potential examples, though. In 2025, Amazon claimed to blacklist (which blocked the apps from being sideloaded to Fire Sticks) four video streaming apps for malicious behavior. At the time, AFTVnews reported that two of the apps served as residential proxy providers and were considered riskware, and that the other two had APK files that were flagged by virus-scanning tools. Safari and Chrome also flagged one of the apps' official websites, the publication reported. And in 2018, a botnet that infected Android devices with cryptocurrency-mining malware appeared on some Fire Sticks, per discussion on XDA Forums. That said, Amazon also has a history of disabling apps that let users circumnavigate its home screen that Fire devices, including Fire Sticks and Fire TVs, have increasingly used for ads. Worth noting: developers can continue sideloading apps onto Vega OS devices if they register them with Amazon.