On a no cost Internet 2.0 website, everyone can make content and backlinks for their web pages. If you only do it to build backlinks then absolutely sure it will be considered as grey hat Web optimization. Upon moving into the keyword phrases which might be related to your sector, https://www.seobyaxy.com/blog/what-is-dofollow-and-nofollow-backlinks-and-what-does-each-mean-for-your-rankings/