So far, this thread seems to be focused on copyright, so I won't repeat any of that. :)
I struggle when I come across profiles of my ancestors that have huge sections of copy/pasted material from other sites with no citations.
While the material and the lack of citations is frustrating, the bigger problem to me is when we have a group of profiles that have obviously copy/pasted material that is historically significant but there is little to no information about the PERSON!
I'll make up a few examples here to not call out particular profiles or managers.
Let's say for example, I stumbled across an ancestor what was a Volga German and someone had created a profile for my ancestor, their ancestors, their siblings, and all their descendants and on every profile was a detailed explanation of what a Volga German was, the history of Catherine the Great, the history of how Volga Germans were treated, murdered and imprisoned by the Russians and how some escaped to the U.S. and elsewhere that was copy/pasted from Wikipedia, a historical society, etc. This information is important, but does not belong in a profile of a person, let alone dozens of profiles.
If you look a Wikipedia, biographies of famous and infamous individuals do not duplicate the work of other sources. They may paraphrase it and source it, or it may just be mentioned in a few words that are a hyperlink to another Wikipedia article.
The really cool thing about the internet is the ability to link to anywhere else on the internet! There is no reason to copy/paste the internet content into a WikiTree profile.
I get geeking out about history and finding cool things out about our ancestors, and I am not discounting someone's desire to write their own version of the history, but this doesn't belong in every profile. Instead, this is what projects and Free Space Profiles are for.
We can create Free Space profiles, for example, for Volga Germans, everyone can contribute to the Volga German profile and use it like a Wikipedia article, and then all person profiles can then link to that Free Space profile for the details on Volga Germans.
Profiles of persons should not be run-on, or long, they should be easy to read and concise and provide details about how that person fit into history, not an essay on history itself.
I get that this is more personal opinion than WikiTree standard. But I'm using the fact that WikiTree is a wiki, like Wikipedia and we can learn something from how information is presented there, as well as the fact that we have a template for long profiles:
https://www.wikitree.com/wiki/Template:LongProfiles