Sadly, there are some who are doing this for their personal gain.
A high number of subscribers does not mean they are good guys!
DON’T FALL FOR SCAMMERS!!!
NEVER, EVER give your credit card information, your PayPal or other financial information or your private infomations to ANYONE!!!
If you are affected you can contact this email address (*) email@example.com.
The linked video shows an example of such a scam.