> If an artist's work gets used in any public way (promo materials, game launch) then they can use that work immediately for their public portfolios

Do you see this case being prohibited as the norm for other studios? (the cited section only talks about art "locked away in vaults")

> In the situation where it's not released we have end dates in the contracts for when they can use their work in their portfolios.

That's actually quite charitable, but IMO understandable how difficult this is for larger companies. After all your company paid for that product of work, which also reveals parts of your creative process.

Imagine Ford paying someone to make five car-designs, ending up using one of them and ultimately losing full control over the remaining four...