I think even if Mark Zuckerberg considers himself to be a fair and reasonable gatekeeper, there is still a problem, as explained by this note on cultural hegemony (https://civic.mit.edu/blog/natematias/net-neutrality-and-heg...). The marginalised will simply get even more marginalised.
The problem with gatekeeping is that nobody can be qualified or suitable to fulfill the role of gatekeeper. Focusing on arguments like cultural hegemony is a distraction that gives the impression if enough symptoms are covered-up that the root cause can persist.
Right, of course. My point was that even if there is someone who was perfectly qualified to be a gatekeeper, there are still other problems to consider.