This is what I think people often miss in those discussions. There is an assumption that everything shared/'hosted' online is someone's opinion and thus should be allowed to be shared. This was never a case on the internet, don't trust what you read online. What should be regulated is what can be advertised, because most what you read is indistinguishable from an ad. Smoothies cure cancer - an ad or someone believe some antivax type bullshit? What if it's an ad to vote for a particular party because the other will do unbelievable bad things? Fanatic or serious opinion? Should you allow those kind of post on your platform?

In my opinion you should just because it is the only way to make sure that your platform is not taken seriously and will prompt people to read something a bit more serious. It will stir controversies on twitter but who in IRL seriously considers an opinion of a twitter person?

Edit: I went for a smoke I thought about it a bit more, take a look at voat vs reddit. Voat was created as a response to censorship on reddit and look at the cesspool of a place it is. Companies do not censor content because they have a moral stand or a political agenda, they moderate the content because otherwise it will turn into a shit you wouldn't believe (HN does it to). There is much more trolls on the internet responding to everything they can than legitimate people trying to have a discussion.

New Eternal September started with social media and those not hardened by the internet before have a hard time to just dismiss what they read as 'a troll'