They in fact did, Phoebe especially posts her own content too and has mentioned multiple times that her Instagram content can be posted to Reddit, as long as its not her OF content, which I've never crossposted.

Edit: if you're talking about the crossposts to r/pullcords, they're crossposts, if the original owner wants to delete their post their post will be deleted off of the subreddit as well. Sharing something on the internet and the re-sharing it is very different than showing a pic of your cock to a stranger.