What kind of backlinks are these?

I see these websites all the time on backlinking reports for some of my competitors, but I am really confused as to how people get backlinks from them.

Does anyone recognize these type of website? What is the value in them, and how do people generate backlinks from them. Super confused!

https://www.rent-real-estate.com/
https://www.constructionz.info/
https://rentalsz.com/
https://real-estate-us.info/
https://globalrentalsite.com/