This is what is called plagiarism. Sam copied Trevon's post, and published it as his own. In the early days, it could pass unnoticed, but now it may cost the thief the loss of earned STEEMs for that post and significant drop of his Steemit reputation.
Anyone is free to report plagiarism to @steemcleaners. Here is an example of how it works https://steemit.com/steemcleaners/@steemcleaners/steemcleaners-report-for-february-23-2019