Worry about not making your ideas happen in the first place.
When I was a book packager, we ended up publishing about 120 books and pitching another 1,000 that were never published. In all of that time, I can only remember one of our ideas (it was a big one) being stolen from us and published without our participation. That code of ethics created a feeling of intellectual safety. But, at the same time, it was our successful books that were copied the most–and that copying was not just a symptom but often a cause of their success.
If there is one person worth copying, it’s Seth.
Relatedly there’s a good book I listened to called Information Doesn’t Want to Be Free by Cory Doctorow. He argues that by protecting your idea with wrappers of digital copy protection you’re stopping your work spreading and being bought by more people than if you didn’t have any copy protection at all.
