The following article outlines the risks, legal implications, and security concerns associated with "cracked" versions of YouTube, such as modified third-party applications.
Cracked apps might save you a few dollars, but they can cost you your data security or your Google account. If you do go the modified route, stick to well-known open-source projects like ReVanced and download from a site you don't 100% trust. youtube cracked version
If you need a formal citation for a project, I recommend searching or IEEE Xplore for these specific terms: "Security analysis of modified Android applications" The following article outlines the risks
But then the videos started changing.