Unless keeping the cause of removal secret is also a legal requirement, then this is by definition shady. And you assume that because some removals are results of legal complaints, then all are. It is Archive's choice to keep us in the dark regarding removals, and it is our choice not to trust them for it.
We aren't being kept in the dark, we know the reason some content is unarchived and they say which content is unarchived.
Your complaint is like going to a store with posted hours after closing and demanding an explanation for why they aren't letting you in. It's possible there's some vast conspiracy to block you from shopping, bit it's more likely they're following the posted rules.
Because of their deliberate policy of secrecy that forces you to assume, instead of know. As this is the 3rd time I repeat this same point, it will also be the last.