I think that all sources have biases, whether intentional or otherwise. You mention "big news channel" as an example of "fake news;" alternative news outlets can also be biased, but IMO the opinions can actually be a benefit so that you understand viewpoints not expressed in the establishment. On a related not, you could also read different (mainstream) news outlets from across the aisle and compare the different presentations of information.
That being said, I think that Reuters a lot less biased than a lot of other mainstream media. Although I couldn't find a source when a glimpsed at the Reuters news site, Wikipedia claims that Reuters has a "value-neutral" language policy: https://en.wikipedia.org/wiki/Reuters#Policy_of_objective_la...