You would need to gain permission to use copyrighted content if you are going to make money from it. Generally, you can use copyrighted content (covering songs and such) if you make no money from it. The copyright holders might put adverts on your video so that they make money from it instead.
Yes, soundtrack in YouTube videos is copyrighted. If you want to use somebody else's content, you must get permission from them in order to avoid getting into any sort of trouble with copyright.
Yes, just make sure to add the audio to your video in a video editor and then upload your finished content onto YouTube. Also make sure that there is no copyrighted background music or any copyrighted content in the background.
There is no magic number for the amount of copyrighted content used that will lead to a copyright notification. Fair use is a very ambiguous rule and is judged on a case-by-case basis. To be safe, avoid using any copyrighted content in your videos at all.
Copyrighted content is difficult to find on YouTube. Copyright owners are able to file a DMCA takedown notice to content that infringes their copyright on YouTube. Thus, it is unlikely that you'll find any full episodes of YuGiOh on the website.
Unless specifically from public domain works, anything and everything on YouTube is copyrighted.
You can delete an account on YouTube by logging in to your account and going to the account settings page, then visiting the advanced account settings page, and selecting the "close account" option. Just be aware that if you close your YouTube account, you will not be able to choose that username again and all content and history your YouTube account has collected will be deleted.
This statistic is not released to the public. You can get a feel for how many videos have used copyrighted content for a specific song if you search the song up in YouTube Search.
Youtube.com/smosh hasn't but their old account was for copyrighted materials towards their pokemon parody
No, once you monetize your YouTube channel with AdSense, your YouTube views won't earn you anything. It's not very likely to make serious money from YouTube views alone, but the visibility from YouTube views can help you increase your income from other sources.
It depends on a lot of factors, most notably what agreements the rightsholders have made with YouTube on how to deal with content they feel is infringing. The video may be blocked or deleted, your account may be blocked or deleted, the audio (if applicable) may be silenced, or the rightsholder may simply choose to have additional ads put on the page, such as links to where viewers can legally view or purchase the content.
You would need to use a movie editing software. Some music that is copyrighted will be removed from YouTube, so make sure you have permission before uploading any copyrighted content.
You would need the video file. Uploading copyrighted content without permission is not allowed and may result in the removal of your video.