Swagbucks has removed the ability to purchase Swagbucks. Swagbucks previously offered the ability to purchase Swagbucks for less than facevalue, making it easily profitable. Earlier this year they stopped you earning anything when a referral purchased Swagbucks and now Swagbucks has removed the ability altogether.
Not a huge change for most people, but you were able to use a credit card so it was a useful way to generate a small amount of spend. I always thought this was a bit of a weird feature and assumed Swagbucks mostly did it to give themselves some extra liquidity when waiting for merchants to payout.
Hat tip to reader Tom & Roman