"Hamas began to rake in taxes and kickbacks from salaries, sale of goods and smuggling, a sum that now reaches up to $300 million to $450 million a year."
"Hamas’ leadership has invested its income in an international investment portfolio worth $500 million in real estate and other assets from companies in Algeria, Saudi Arabia, Sudan, Turkey and the United Arab Emirates."
https://www.nbcnews.com/news/world/gaza-plagued-poverty-hamas-no-shortage-cash-come-rcna121099#StopHamas