Backlinks used to be a huge part of SEO landscape. Now, backlinks are killing website position rankings.
Google is removing thousands of paid backlink websites. So, use caution when you agree to list your website within these paid backlink websites. Google is taking them down so fast that your paid effort will go nowhere. Save your cash and work on updating your content.
NB: Avoid dofollow links from dangerous sites. You can still get more traffic from search engines without be so worried about backlinks.