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A webapp is run as a service. You're charging people for a service you provide. That makes it very hard to copy. A photo isn't a service. It's a collection of bytes that is trivial to copy. If you want to make money as a photographer, you need to structure it in a way that means it's hard to copy. But these days, anyone can take pro quality photos with minimal talent. If he's an exceptional photographer, he should be…
You know, it is pretty easy to kill someone. That doesn't mean it's morally acceptable, let alone legal. It doesn't matter how easy it is to copy the photograph. It's still not morally acceptable or legal. As to your second argument, that 'anyone can take pro quality photos with minimal talent': image quality isn't all that counts. In fact, it's substantially less important than composing a good photograph in the fir…
If you run a bike-shop, don't leave the bikes out front without locks. They're going to get stolen. Don't bitch about society when they go missing. If you're putting art out on the internet, don't bitch when everyone has a copy. At least watermark that sucker.