That's a very good question. Here's the full eligibility criteria from the terms and conditions:

I. ELIGIBILITY

*Eligibility Criteria: Subject to program limitations and terms and conditions, the Amgen SupportPlus Co-Pay Card is open to patients who have been prescribed an Amgen SupportPlus product and who have commercial or private insurance that covers an Amgen SupportPlus product, including state and federal plans commonly referred to as "healthcare exchange plans." This program helps eligible patients cover out-of-pocket medication costs related to an Amgen SupportPlus product, up to program limits. The Amgen SupportPlus Co-Pay Card does not cover any other costs related to office visits or administration of an Amgen SupportPlus product. There is no income requirement to participate in this program.

This offer is not valid for patients whose prescription for an Amgen SupportPlus product is paid for in whole or in part by Medicare, Medicaid, or any other federal or state healthcare program. It is not valid for cash-paying patients or where prohibited by law. A patient is considered cash-paying where the patient has no insurance coverage for an Amgen SupportPlus product or where the patient has commercial or private insurance but Amgen in its sole discretion determines the patient is effectively uninsured because such coverage does not provide a material level of financial assistance for the cost of an Amgen SupportPlus product prescription. This offer is only valid in the United States, Puerto Rico, and the US territories.