But it's not like any of us own most of the content that we post? If someone posted my photos on this site but give full credit and a source link, even if they didn't ask permission first, I really wouldn't give a :emoji_zipper_mouth: as long as no money is made from them by other people.
I think it's more the fact that when people take a photo, they feel a sense of pride in sharing it and when people like their post or give them a nice comment back, they feel appreciated which encourages them to take more photos and share them with everyone, which benefits the whole community.
I agree that a lot of the time the content we share on this forum isn't owned by each individual person when we share a photo, and there's nothing wrong with that, but it's not a nice feeling when you want to share your photos with everyone and you discover that someone else has beaten you to sharing the photos you took yourself.
There's nothing wrong with sharing other people's snaps. as long as you give them credit, you just need to respect that they might want you to retract that post you have made so they can share their work with everyone, because at the end of the day they are the person who has spent their valuable time taking the photos and therefore they are the person who should be given the likes, the credit and the appreciation, rather than the person who simply copied, pasted and shared their photos to the community.