He exposed terrible things done by large powers, therefore he was persecuted absolutely.
I'm reading at some sites that this isn't really true and that he wasn't literally held in a 2x3m cell for 23 hours every day. Although it's not very clear what were the actual conditions.
edit: https://www.ohchr.org/en/press-releases/2019/11/un-expert-to.... it's very vague and unspecific though..
Well, who is gong to stop them?
There are a lot of countries they have never published anything on. They have a smaller number of large leaks, so that is not necessarily out of the ordinary.
I think it is credible that Wikileaks were provided some documents from Russian state-sanctioned actors, who knew Wikileaks would publish them, and that the state-sanctioned actors did so to serve Russian interests. But the claim that Wikileaks as a whole is biased towards Russia doesn't seem likely.
Besides. The US and Europe and so have fairly free media, so the Wikileaks revelations reached a wide audience. Russia does not have free media, so if there were any leaks like it, it wouldn't reach the Russians as much.
Some people disagree with this, see https://x.com/joni_askola/status/1805628043760685317 and the whole thread
You can’t diminish facts depending on who is telling them - as long as these are facts.
Either he never had been handed any significant leaks on Russia, either he chosed to not publish them.