Other outlets are accepted [by general public] to have already been compromised wrt bias.
Up until the Trump campaign - Wikileaks was considered to be an unbiased leak of private and/or confidential information.
The name "Wiki" even intentionally evokes the name Wikipedia, the (slightly biased) generalist source of information that appears at the top of many of our search results.
In many cases, Wikileaks is actually worse. Seeing MSNBC or Fox News flash on the screen, we know the bias put forth by the company. We don't know Assange's bias. Correction, we do now.
To be honest, I'm curious to see how your logic even equated Wikileaks to other media outlets in the first place.