I don't want to be overly-sceptical but, here's a more attractive offer (if it were possible).

Portugese government allow residential purchases valued between 250,000 - 500,000 in Bitcoin, in exchange for visa on conditions such as:

Prior no criminality, no debt, background check. Signing an agreement that after 2~5 years, candidate can take a Portugese language proficiency test, and on passing, they can then apply for their residency.

Government gets certain amount of benefits from a healthier diverified portfolio of assets, and aid to property market but attracts people who are interested in Portugal and Potugese way of life

Visa applicant gets a stable offer (home and a route to a happy life in Portugal.)