Version 16.40.35 is over five years old. Hackers have since discovered multiple vulnerabilities in the underlying code of this specific build. A malicious modder can inject spyware into the APK that:

: The ability to continue listening to audio while using other apps or when the screen is turned off.

: Version 16.40.35 is now several years old. As YouTube updates its backend servers, older modded versions frequently break, resulting in "Content not available" errors or app crashes. Modern Alternatives

The most obvious benefit is the removal of all advertisements. This includes pre-roll ads (before the video starts), mid-roll ads (interrupting the video), and banner ads on the home screen.

Supports watching videos in a small window while using other apps (on Android 8.0+).