It depends a lot on how you do it. If you don't do it aggressively and mix built backlinks with naturally earned backlinks, you should be fine. Keep in mind that link building is only hazardous if you don’t know where your links are coming from or acquiring dodgy un-vetted links. All of the sites we get links from are owned by real people, and their domains are vetted for any spam and tested on sites already. We can guarantee the safety of your domain from manual penalties when using our services.