It, the Gemara quotes him in several places (for example, Baba Batra 98b). Some say that Rabbi Akiva’s statement only applies to those who are kovea itim. Others say it only applies to those who consider them kodesh.
RY, no one says that free speech is absolute. That would lead to much greater problems than ruining a platform. Thus, for example, libel and slander are actionable, there is the “clear and present danger” rule, etc.