Not 100% sure I'm reading this right but,
The tiers are intended to encourage actions that are positive for the marketplace and recognise and reward artists who invest time creating and promoting unique products.
Hum... Great, so if you wanted to have a redbubble on the side to make some money then you're basically not welcome???
And seriously I am in tears at that like wow. Basically, if you make enough money for Redbubble, the fee is removed. Basic tiers have to pay a fee, but premium and pro don't.
There's also the "opportunity to create licensed fan art" that bugs me because, there already was a list of things you could make fan art of depending on the list they have, but now you can't unless you have a premium or pro account? While (from what I've seen at least) most small artists make fan art and sell it because they know that there is a fanbase for it and that it will sell.
I do understand the copyright problem they face, sure. But the rest still is... not good.
Over the past few years the amount of new accounts and content has increased significantly on our marketplace. This has resulted in increased costs as we’ve needed greater investment in resources to operate the marketplace and support our artist community and your customers.
So yeah, increased costs that they will make the small artists pay for and subsequently make people think twice before coming on the plateform, or just leave it.