Yes I do flag plagiarism, I check the age of the account and if the person is new to the platform, has posted ther own content before and copied an article from the internet, I dont flag, but I explain that the community can see it and cheetah will be on them, as will steemcleaners and others like me.

However if someone copies another steem users post, then no warnings, immediate flag. Also plagiarism accounts that have many posts, I flag them all and report to steemcleaners on the Discord.