Also to note here. The credits used to be at the start of a film. Since it was at the beginning there were typically less people credited becaue there was less time. (You obviously didn't want to make people wait too long to see the film but long enough they could get into the theater with their snacks). Once it moved to the end, there was no reason to not include everyone.
This is also why we got the post credit teaser or scene which was a directors way to force the audience to see the whole credits
I don't know if this is 100% true or not, but I in The Goldfinch stolen art is used as collateral for criminals. The items are known to be worth money and can be used as collateral for various criminal activies. So it can be passed around. Not sure how true that plot point is.