In third-world nations, plagiarism is not a serious matter even in university, college, research articles or business companies.
In forum globally, Bitcoin talk forum is a most serious forum about plagiarism but unfortunately plagiarism cases nowadays tend to be handled considerably softer than the past especially in 2018 or 2019.
This is true. Nobody even bothers to check the papers in my university back in the days when written homeworks were a common activities. Not sure if other sites like Facebook and Reddit handles plagiarism differently, but surely some subs in Reddit related to writing enforce those kind of rules (cause why not?)
Due to this, I am not surprised why a lot of newbies are getting nuked easily due to plagiarism.