Vote with your wallet
The more I think about my previous post, the more adamant I feel about it. Itunes’ no-credits policy is extremely bad for musicians, producers, engineers, studios, mastering folks, etc. Let them know you want credits. If at all possible, spend a few extra moments and try to find a site that does support credits and buy your music there instead of itunes. Then let them you did so and for what reason. If there is a market call, they will respond.
That is all, thank you.