Everyone is busy in doing guest posts. Writing 700+ words of articles and get 1 do-Follow link. You may get penalized after new algorithm hits because they are not natural links, you can’t make google a fool by doing this. To make it natural you need to add few more authoritive links to that post. Your all backlink should be well balanced with do-Follow & no-follow links.
PS: I’m not sure but observed that, If I wrong please correct me.