Actually, it
does make sense because it protects OtLand from being directly involved. It is intentional wording.
Like for example if someone sells a HD upscale spritepack, they would essentially be enabling sale of CipSoft's property, which CipSoft can sue them for. Also if someone sells a server pack that is a virus, people can argue that OtLand is responsible because they didn't ensure that a product being sold on their platform was safe, even though it was sold by a third party.
It's the same reason places like eBay don't let you sell pirated Disney movies, or things like bombs, drugs or malware. Because they would be responsible to making sure that the stuff sold on their platform is safe and not illegal or harmful.
It is very hand-waver'y to say "Can't sell a product, but selling a job to make it is fine", yes. But it works, legally speaking.
They're not responsible for the end result, they're just responsible for mediating the meeting between a person who needs something done, and someone who can fulfill that need. That's why Craigslist for example don't have ads for naughties, but plenty of "escort services".
They do of course have a limited liability to making sure the people they mediate aren't scammers, but that is why you see actions taken by moderators like banning people who are proven scammers, and why we have the
Community Recommendation Thread.