Respect to the 40% who don't think it's right to copy another person's work without permission, whether to sell, gift or keep for yourself. For the other 60% here's how I see it...
Say I want to make a kangaroo (I've never made a kangaroo!). I don't scroll through Pinterest looking for the most appealing kangaroo then just try to copy that. I would look at images of real kangaroos, notice their shape, expressions, colours, the way they stand and move, make a few sketches and work out what position and size would work best in the medium I use. Then I'd make some templates and mock up a kangaroo, seeing if my idea worked, probably realise the tail was too thin so it fell down, or the ears made it look like a rabbit. So I'd keep tweaking until it looked right, then choose the perfect material and make a prototype, which I'd then embellish in the way that is noticeably my style. Then I'd spend a few hours finding the perfect place for a photoshoot of the kangaroo, set up a scene, then edit the photos. I'd then make another kangaroo, timing how long it took so I could price it above minimum wage for me but affordable for my customers. Then I put it online to sell.
Someone will then pin my photo to their board or share it somewhere online. Despite there being (I expect) hundreds of kangaroo patterns for sale and plenty of free kangaroo tutorials, 60% would rather not spend a few quid on a pattern or make the effort to think creatively themselves, instead they somehow feel entitled to piggyback on all the time and effort I've put in coming up with this particular kangaroo.
That IS being a CF and it is stealing someone else's idea. Makes me think of Burglar Bill - 'that's a nice kangaroo, I'll have that'.
But yeah I know there's FA I can do about it. Some people are shitty. I am grateful that my work sells well and I love what I do, so that's what I need to concentrate on. But it would be nice if people thought about what and who was behind the images they're copying.