Good for you to own up to this.
Indeed there isn't much by way of rules and best practices, but the will of the users are the final arbiter of what is acceptable or not. Plagiarism is bad policy in general and just because it might be ok for a lot of people and other websites, that doesn't mean the users here have to tolerate it.
I hope that eventually eventually a best practices for content will be discussed and published for all users and especially new users to get an idea of how they should make things.
The last thing I want to see here is people copying others content to profit from it without giving credit to the original source. This isn't kat.cr or piratebay. We can do a good thing here and make it an awesome community or we can be jerks that take others work like selfish children.
It's our choice to make, so where do all of you stand?