We had automated filtering of word lists that took down sites, that were hate words / porn related for protecting children.
Right now I'm paying monthly for Youtube Premium, but I see that the people I'm watching have to be extremely careful to not say a swear word by chance, or even say the name of the COVID-19 virus, because they are scared of losing their revenue stream. I don't see this as fair, because Youtube got so popular _because_ it was allowed to publish anything without being responsible for copyright violations. It would be great for them to do fact checking as long as they are politically consistent.
In EU at least we have the GDPR that limits companies from using our data however they want to, but in the US at this point they need some kind of counterbalance.
Regardless I wasn't comment on the morality of what big tech companies were doing only the legality. Nothing in https://www.law.cornell.edu/uscode/text/47/230 suggests to me that the protections are in anyway contingent on not removing certain content and certainty nothing suggests its contingent on not publishing content yourself in different contexts.
When a new law is being created, often it is created _because_ something legal, but immoral is being done by a person/company.
Also the law you refer to is a law inside the U.S., but Alphabet earns more than 50% of revenue (and most views) outside US. It was doing illegal business in the EU multiple times on grand scale and was given fines for it.