Why should wps free templates be watermarked?

Because this is a way for creators to declare copyright, which can improve their popularity. You can remove the watermark yourself.

The method of removing watermark in PPT;

Step 1: Open the PPT presentation and select the Edit Master tab in the ribbon below the design.

Step 2: Under the edit master page, select the first slide master, then select the text box where the watermark is located, and press the Delete key to delete it. Of course, if it is a picture watermark, it is also the same deletion method, so I won't give an example here.

Step 3: After deleting the watermark, click Close under the slide master to close the master view. The watermark is removed.