alt Hacker NewsCopyright was only necessary with mass reproduction. The Gutenberg Bible does not yet qualify. The Berne Convention started in 1886, where the problem became more pressing.
And as I said, art was always paid for. In the case of monarchies, at least their advisers usually had good taste, unlike rich people today.
If you are talking about patronage and other forms of artist compensation, nothing about the economics of that is less robust today than ages ago. NFT craze of yesteryear is proof. So is OnlyFans success. Taylor Swift collects a billion bucks touring the country. AI will not change that; not negatively. If anything it will enrich the customer base and funnel more funds to them. The thing that AI does change is internet-wide impression-based and per-copy monetization.