May i say, "I told you" here? So many people ask this, understandably. We have so many who do not understand watermarks and how they work.
Alexander, as others have said, the watermark is purely to give the appearance of helping protect the work. I say appearance, as watermarks are quite easy to remove nowadays.
But it gives some people peace of mind. However, it also can stop sales. I use it. Many people do not.
To remove it, you have to reload images
To not have it on future uploads, use the default settings to turn it off (or on)