They never posted any content to OF. All the stuff you've seen came from Kendra's old tumblr account or from a leaked Snapchat account. If there are any OF accounts out there it's an impersonator or H&K are just registering an account to hold their name to prevent impersonators.
But you gotta think there making enough money anyways they don't need to sell nudes hell I've seen like 5 TikToks where they are plugging something so I highly doubt the money is gonna run dry for a while and especially if stupid people who don't pay attention to post keep subbing to them and buying pics just hoping one will show a nipple or something that's really just Instagram pics