Why am I not eligible for airdrops?

Could you please elaborate on the reasons why an individual might not be eligible for cryptocurrency airdrops? Is it due to technical issues, such as not holding the required tokens or being on an unsupported platform? Or could it be because of regulatory constraints, meaning certain jurisdictions might exclude participants? Additionally, does participation in airdrops require a certain level of activity or holding period? I'm curious to know the specific criteria that determine eligibility and what steps can be taken to potentially become eligible in the future. Thank you for your assistance in clarifying this matter.