It’s not going to be Tumblr all over again if they choose to ban it. But I wonder how many people use Reddit just for nsfw.
As for an official paid feature: as soon as they start collecting money for video related features, the video creators will start circling for their cut of the revenue.
Not anymore, they've banned it.
NSFW content can work perfectly fine to get users on the platform, even if it can't be monetized.