Another interesting study might be to investigate YouTube channels that have been banned, what they have been banned for, and see if left-wing and right-wing youtubers are (approximately) equally represented.
I actually don't disagree with your point. What you will notice with the media ban on right wing vs left wing issue is about money. On youtube for example, take someone called Alex Jones, he had a channel and youtube didn't really care for years and they made a lot of money out of him. What changed? It became too hot at some point and the potential commercial impact on youtube meant that he got the chop.