The problem is the concentration. One person majority owning a platform as influential as Twitter or an expansive media empire (Murdochs) is not good for democracy. If the empire was split up to ten different multimillionaires we'd be better off.
In the UK we have the BBC where every word is considered to be a fact. They have TV channels and radio shows where 'today's curated and extremely edited sound-bites' are broadcast every 30 minutes, 24/7.
At least with billionaire owners it's taken as read there is going to be some nuance.