The EULA Says no.
Backpacks allow, I'm assuming, users to carry more items than their inventory can, so more backpacks for donors changes their gameplay.
Vaults, I assume, protect items, and more vaults for donors = more protected items for them. Changes gameplay.
Both are disallowed.
1
It is not the problem of premium.
If he is cracked the window should show some message like access token blah blah blah
but he is time out.
1
Just spend more time playing MInecraft. You will eventually find it.