I sit on the fence on this one. I've been doing research for 30 +/- years, and I have a ton of documentation and photos that I'm happy to share. My problem was when a DISTANT relative started uploading short biographies that I've written over the years in such a way that it appears SHE wrote them. When I mentioned it to her, she didn't see any problem with doing that. I'm big on documenting everything, and I've worked hard over the years. Please don't take my hard work and pretend that you are the one who did it.
One of my pet peeves: If I upload a photo, it's in my possession, or I have permission to upload it from the person who "owns" it. I document that. I can tell you where the original is so you can follow the trail back to the original. So many people don't do that. There is a wonderful photo on ancestry.com that is SUPPOSEDLY of my g-g-g-grandparents, but there is no documentation. When I contacted those who uploaded the photo, they can't tell me where the original is, or where they got it from. How do I know who the people in the photo are if you can't even tell me where you got it??? That's no better to me than cutting a photo out of a magazine and uploading it as my ancestors.