Usually it is a responsible adult that has already established credit that the credit card companies offer Unsecured Credit Cards to.

These cards & credit lines are most often reserved for those who have proven themselves in the credit arena & are trustworthy to make their payments on time.

They also usually don’t max out their card limit but use it very frugally & keep up with the interest & payments on a consistent basis.

It is indeed a very rare occurrence that people with no credit or bad credit are ever offered a line of credit that is unsecured.