Am I being scammed by a prominent YouTuber?
Have you tried to withdraw money from there? If you can't do that, then you've been scammed, if it's a legitimate platform, then you won't have a problem with withdrawing money.
What is a prominent Youtuber? Do you know that it is possible to buy subscribers for the YT channel, so that number is not necessarily in a positive relationship with the quality of the material placed there?
"is an American YouTube channel with over 292.00K subscribers. It started 9 years ago and has 196 uploaded videos."
"Only" 196 videos for 9 years and that brought 300k subscribers... This sounds surreal to me
In addition to the possibility that you were deceived due to a hack or phishing site, how did you trust some unknown person from YouTube and invest $10k?