Your freedom stops where other peoples freedom start.
All instances, except tankie ones, have freedom of speech.
Definition varies for example between Europe and US. In Europe you have freedom FROM, in the US it’s more like freedom TO.
Freedom TO can be dangerous as some peoples think that it means they are allowed to say hateful and harmful things. Hurting others is not freedom of speech, it’s just being the shit stain on humanity toilet paper roll and you won’t have that on lemmy. Unless by creating your own no-rules instance that will get defederated by everyone.
But as long as you are not insulting and harming people, yeah you have freedom of speech everywhere, just the normal sane amount of freedom.