Any link that you get inorganically or by purchase is called a black hat link. But if you reach out to another site for links through guest posting without paying any fee, it is regarded as white hat SEO and it’s not an offence. However, acquiring organic quality links especially as a small business is not as easy as it sounds. That’s why many of these small businesses engage in black hat links because no authority site would willingly want to link to a small business page without proper reasons. Small businesses usually have a hard time getting quality links so they have to engage the service of link-building companies.