We might not be able to stop thieves right now, but we can do everything possible to make it difficult and I have a suggestion, some of the people uploading files already do this, so the idea isn't really mine.
When you save your template as well as giving it a name put your name or initials and something like "a free template from UKScrappers", just a suggestion put what ever you think. At least they will have to rename all the files.
Here are a few other things you can do to make life difficult for thieves.
Include something on the page that they have to delete here or they can't see. I have added something to this file that is going to be a nightmare to remove see below the only way to see the word is to select all.
After saving your file right click on it and from the list choose >>> Properties >>> check the 'Read Only' box
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