the government didnt tony, free speech doesnt necessarily apply to the majority of major internet services/companies/companies based mostly on the internet, as the internet is a global service, there for certain us laws dont ad here on it
a privately owned corporation on the internet censoring media on their site =/= the government applying censorship. companies are allowed to censor whatever they want within their domain unless stopped by one of their countries agencies with high enough ranking, such as the FBI taking down a site through the domain host
would censoring reasonable content for no reason be justified by them owning the domain? not necessarily, since might doesnt equal right