He's certainly not using anyone else's money. It is money that he's received from making videos.
The difference, I think, is the same difference that there is between donating money anonymously and donating money under the condition that something is named after you. The former is transparently good because it can only be done for a good purpose. The latter may be done for a good purpose. You might want everyone to know you donated so that you can set an example for others: "I am a popular actor and if I do this it will bring attention to this cause". But we often get the feeling, I think, that the donation would not have been given if not for the quid pro quo, and then it feels a bit dirty: more like buying indulgences.
Here he's not giving the money away just so that he can say "look what a good philanthropist I am" but also so that he can record and publish videos of it to make money. That makes it twice as dirty: doing something that ought to be done for its own sake and using it as a means of achieving an end that is, let's face it, his own benefit.
If he were doing it differently, then it might be different. If it felt like he had structured the operation so that he was only making all this money to funnel it into a charity, that would be different. But he's not: he's not making money in order to do charity, but doing charity in order to make money. He's reversed the means and the end. That is deeply uncomfortable.