Kindly read the article.
"[I] decided to make a little tool to help me scrape the posts of my competitors and publish them to my group on a regular basis."
And
"I had created a spicy mix of public domain content, some supposedly copyrighted content from unknown authors, [...]"
I found this particularly striking:
"Usually it was the content of some authors that were difficult to track and attribute to. Sometimes it was blatant plagiarism."
So you were/are well aware of the problem. But instead of Doing The Right Thing (find out source, ask for permission) you just declare that to be difficult (and yes. It is. Full ACK).
That's why I asked you to reread the article (sorry, I should be more precise on the reason).
However, even in this ecosystem, I tried to do my best to deal with that issue by paying at least some attention to crediting the authors back by means of watermarks and negotiating the conditions upon which their content is taken.
This is the reason I asked to reread the article. Remember, it's the Russian market, and some things that will apply in the global market, simply don't apply there. Whether it's good or bad is besides the point of this article.
Thanks for the raising the question, it's absolutely legit.
Spoken like someone with no understanding of the local market. ;)
Just as an example, until not that long ago VK was used to post music and films without any restrictions. I think this has now been stopped (not a VK user but there was a court case a few years ago about it and the government has since tightened copyright enforcement) but should give you an idea about how little concern people attach to copyright.
You should also keep in mind that copyright didn't exist in the Soviet Union as such, so the idea is quite alien to people and they are still getting used to it.