This is not meant to be offending, but the examples given are from the look at the steampage not really comparable. It's visible that both "steal" versions are using a different track layout, and they both don't match the same scenery. Comparing these to the "original" version, i'm asking myself...what did they steal in the end? Again, no offense meant, but could it be, that these 3 Planet Coaster players were building their work using the same reference from Disneyland Paris? What was hijacked? No one of them has the right to claim Thunder Mountain for themselves. Maybe i'm wrong, and there's some kind of genius element which was copied and not referenced...idk. But If we start comparing and complaining about "stolen" stuff, it has to be managed by professional community managers, not by users. Like in this case it leads to a certain kind of witch-hunt where all feathers are suddenly ruffled. It should be clear to ANY steam user that if you don't want your stuff stolen or copied, you DON'T load them up in the cloud. As soon as someone uses your creation and just turns a simple stone in your mile long blueprint, it's his own. And by the way, you WANT them to use your creation, don't you? If not, don't upload your parks. No one can copy screenshots and videos into their parks and claim them as their own
Now, considering someone just changed some details in a blueprint and reuploaded it, considering someone is very young and uses user generated blueprints all over his park, it's not up to us as part of the community to ban or condemn them. A notice would be nice if someone uses blueprints, but this is something for his own work. The workshop is about sharing, not about getting famous. If you share something, you have to give up a bit about the ownership