A: Yes, it is a possibility. Using any modified version of the YouTube app is a clear violation of YouTube's Terms of Service. While bans may not be immediate, Google has shown a willingness to crack down on third-party apps, and your Google account could be suspended as a result.
Put together, likely points to a modified or legacy version of YouTube designed to run on the outdated Android 4.4.4 KitKat operating system, promising desirable features like background play, ad-blocking, or downloads. youtube apk android 444 hot