Man, findom is a tough one to work out regarding how far is too far and what financial/personal boundaries are.
That said, Simba being in a dom-anything relationship with a minor (let alone having financial control of said minor) is unbelievably skeevy. Whose money even is it? Does this kid have a job he's using to pay Simba for his weird fetish (assuming that's what's even happening)? Is he going to start stealing his parent's credit card info to supplement this? Is he just giving him his allowance? I have so many questions.
The point about the source of his money is rather interesting. In the screenshots, he says that $30 USD is his "every last penny." So, he's either a very, very broke adult with skewed monitary priorities (given that he's willing to give a stranger like Simba and FV his money), or he is a minor that naturally doesn't have much money. The conversation is very telling.