Profile backlinks are still valid, but not if done the wrong way.
Google is quite smart when it comes to these. You can have a profile backlink if you are an experienced writer who can write articles for Buy SEO Services a high-authority website. But you cannot have a profile backlink if you don’t have any experience and can only write for your own blog or website.
You are using your profile backlink to build authority and trust for your own blog. That will not work. This is the reason why only a few people are getting away with it.