You seem to be implying that transfer of funds can only fall into a few categories, e.g. robbery, sale and alms. Well, reality is more complex than that.

If two people are married but have separate bank accounts, and one of them asks their spouse to transfer some funds into his account because some joint expense will come out of it - is he "begging"?

When a member-funded NGO reminds its members to pay their annual dues - is it "begging" them?

You could claim the answer is "Yes", but then - the world has a whole lot of begging going on.

Because begging is asking for help with no expected return - either you give them money, or you don't.

If an artist you like asks you for money, it is implied that this money will go towards funding their next project. It is more of an investment.

Patrons of the arts have existed for a long time. Donating to your artist is just the distributed version of that.