That's moderation. Both because they are actively excluding certain content, but also because 'porn' can be subjective and so decisions have to be made about what does and does not qualify.
The huge Aimee Challenor thing, that lead to people being banned anywhere the name was uttered is just the super high profile example I know, i'm sure reddit users would be able to show more smaller cases.
Just want to make it clear, I'm not claiming this control is good or bad, there are good reasons for and against moderation, but reddit is not even close to a free for all.
[0]: https://www.newsweek.com/reddit-aimee-knight-challenor-fired...
If I'm running a car forum, I should be able to ban pro-Nazi rhetoric if I want, regardless of whether I find it offensive or merely technically off topic. Not every space on the internet needs to be /pol/.
Section 230 was an unusually great piece of internet legislation, and it's not great to see it start to crumble with these new changes. Just let every site be its own site.
The definition of political used by the populace is almost always the narrow subset of societal/cultural fights that are actively being argued. Generally speaking these arguments are headed by politicians.
There is also a space in the definition for arguments directly impact the structure/scope of the government. Although this may be separate enough that it may warrant being considered a second definition instead of an additional category within the first definition.
That's not even remotely gray, it's both a political statement and a "cesspool comment"; you're suggesting a false dichotomy.