So many jumps of logic here.
1) It’s not “art.” It’s just something to be sold to people with more money than sense (typically, people who feel their McMansion needs a game room to feel aristocratic, but don’t actually play pool or poker).
Or to sell to friends of couples who registered for their wedding at Tiffany’s.
Anyway,, analogizing commercial products like this to Van Gogh’s process (studio art major here) is silly.
2) No one to my knowledge “hired” Tiffany to make this set. Tiffany chose to make this product to sell to the people described in (1), above.