Why should the government be asked to cover income that wasn't reported / taxed by an individual? There's a clear process to report income that's non W2 (or equivalent)
I'm not in Ireland but it's the same everywhere. No one likes paying taxes.
Not saying that anything should be done about it. TBH I'd even like to have unemployment benefits be an optional insurance to reduce my taxes since I haven't gotten a cent out of it yet, but that's separate.
Just noting that artists aren't in some unique situation.
Nothing is stopping them from opening a company and giving themselves a fixed salary or doing some mix of salaried, freelance and under-table work.