Let me give you the short answer:
If you can't buy the photos there is no case to be made without you spending a lot of money. Anyway, this is exactly the kind of thing that low-res previews and watermarking were made for. Every pro photographer knows that. And if you're posting hi res photos that you want to be protected but aren't watermarked or that can easily be cropped, well, frankly that's on you!
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