Why won't hispanics move to Spain instead of the US?

Let's be honest obtaining legal residency in Spain through "arraigo social" is a much more viable option than a green card in the U.S. Additionally, many Latin American countries have visa free access to Spain, and Spain offers citizenship in just two years to nationals of former Spanish colonies including Puerto Rico. This would grant them European Union citizenship, which is arguably more advantageous than American citizenship due to factors like safety, universal healthcare, and overall quality of life.