Porn is a form of media. The way I see it is that porn is generally viewed as obscene media and it adds no actual content to a 'free speech' discussion so it has no place in a website like that.

I'm sure that Gab would still let you talk about porn which makes it a 'free speech' platform. But putting the obscene material there is a different question. Most people just don't want to see that stuff pop up in that context.