Y2Mate can be legal depending on its usage. For your information, downloading YouTube videos for personal use can be a breaking of YouTube terms since they do not allow any third party to download material from their site. It can also be illegal to download copyrighted material in many countries of the world. YouTube Premium provides a legal alternative by allowing you to download videos via their official systems. Always check your local laws before using any downloading service to avoid any legal issues there.
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https://radarro.com/is-y2mate-safe/