And besides the legal definition, the principle of free speech is about being able to express speech without systematic repurcussions. Censorship by an individual (or corp-as-individual) is tool used by businesses on their platforms and doesn't violate principles of free speech. Systematic censorship that violates this principle is only really wieldable by governments: Making the expression of an idea anywhere have consequences for you, your friends, and your family's ability to go on living (in a threat-of-violence life-or-death sense, not a $ sense).

Free speech zealots tend to slyly try equating systemic censorship with an individual's ability to censor others, thus taking events like this and pretending it is an offense against the principle. It is not, and don't be fooled.