"But me a coffee" isn't literally coffee. It's a way of asking for $5 or so but making it sound more palatable as "well you are just buying a mate a coffee" which people normally do rather than "you are transacting $5 on the internet to a stranger" which people might be more reluctant to do.

But the money won't be spent on coffee, otherwise the influencer will OD. "Buy me a chance to escape the rat race" might be a more accurate title.