As I’ve explained above, reliably giving prominence to the quotes of one source promotes that one source and those quotes as it subconsciously it makes it seem more important to the reader.
This is a technique used for Propaganda when the propagandist doesn’t control the information space of the reader: since outright lies would easily be caught when readers have easy access to other newsmedia, the promotion of one side over the other by the propagandist is instead done by portraying it as more important by quoting it more often, giving more prominence to those quotes and never challenging them.
It’s interesting the number of concerned posters popping out if the woodwork here repeating the pretty old falacy commonly harped by such news media that “they are stating those are quotes hence they’re giving fair coverage” which is an obvious oversimplification of how impressions are made on others and hence of how opinions are made by even the most junior professional in PR, Marketing or Politics.