Ive made a few worlds and uploaded them to multiplyer, always as read only. Im not a fan of having my hard work copied, plagiarize and reposted with horrible and unnecessary add ons...surly i cant be the only one who feels they would like some form of recognition for their work...perhaps some way of adding a name to it? Id hate to be "that person" but its been bugging me for quite a while. Anyway rant over i suppose.
I just add my name to all my levels. If they copy it at least it will have your brand on it. Not many level stealers take the time to erase your name. Now if the stollen level is getting more likes that the original contact Olga. She can fix that problem. But the function of being able to copy a level is important. Mostly when your working in a building group with 2 or more people.