So you understand that a MrBeast burger isn't made by, or from, the person known as MrBeast, but when one pays to join the MrBeast YouTube channel you are certain the comments from user MrBeast are made by the person known as MrBeast? What's the difference?
Feels like you're making this more complicated than it needs to be. The elements of fraud are quite simple:
1. a false statement of material fact
2. knowledge that the statement is false
3. intent to induce reliance
4. justifiable reliance by the victim
5. resulting damages
The "buying a burger from a MrBeast cafe" fails to meet element 1, because nobody at MrBeast burger is falsely claiming to be MrBeast himself.
On the other hand, falsely passing oneself as a model in order to earn revenue for them meets elements 1, 2, and 3. Elements 4 and 5 will depend on whether the victim fell for the scheme.