Then Twitter has to lose their protections as a 'carrier' and become a publisher with all the regulation that goes along with being a publisher.
Applying this to Twitter, Facebook et al. is not that big of a leap.
> completely destroys the business model of several hundred billion dollar businesses
They are not entitled to their business model, especially not at the price of trampling upon something broadly considered to be an inherit human right.
Except they are held responsible if they don't curate. Look at laws like SESTA to see how platforms that don't self-curate content that could sexualize minors are legally liable.
I'm not saying SESTA is bad, I'm saying this idea that platforms need to be hands-off towards curation to maintain safe harbor protection is not true.
Your idea that safe-harbor laws only apply to platforms who don't self-curate is absurd precisely because there is illegal content they, the platforms, can be held liable for instead of the users.