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That's always the safest. Your own property is also protected by default, unless you state otherwise. I place 'all rights reserved' under my work but technically I don't have to. By law it's assumed that's the case. So if someone took your photo or my art, posted it, said something about it (positive or negative, doesn't matter), then attempted to monetize, that wouldn't fall under fair use. In a case like that it's all about the image, and that image belongs to someone, so they need to get consent first.

Awhile back some character here took a whole bunch of my work, placed it in a strange arrangement (some were even upside down), then thought I'd pay for compliments, after making a total mess. It's like letting some random dude come in your house and decorate. That's not how life works.

Fair use is a tricky one. A pixabay image can be used but if you took that image, printed copies, then sold them, you'd be in big trouble. Someone can't just take your stuff and claim fair use.

After having my personal image used by a particular, mentally disturbed, world-traveller I am a bit hyper sensitive to this sort of thing. I don't like people taking what isn't theirs without having the common decency to ask. I used to punish it, in the real world, quite severely. That's behind my stance on plagiarism on Hive. It's ingrained.

I'm not a lawyer so don't know all the intricacies.

Yeah. I totally get it, and know how it is.