"What is Art?" in my mind is like one step down in depth to what is the meaning of life, but when it comes to Hive, I personally would rather people not monetize a photo that they don't own that they ran a filter or a few filters on, but that's just my opinion.

There are no laws here but the ones we decide on and choose amongst ourselves to enforce.

On the other hand if it's a photo you took or that you own, I think that would be fine to monetize or post or whatever. On the other hand, say you took a lot of photos and made a collage, then ran filters on that, I'd think that was fine as well. These are really abstract issues so there's never a black and white answer.