WordPress is free, open-source software, but the company Automattic offers paid-for features such as blog designs, custom domains, hosting partnerships and anti-spam measures.
As with many Web-based services, payments for those features are dependent on credit card transactions and eBay's PayPal service. But WordPress wrote on its blog that PayPal doesn't serve more than 60 countries, and credit card companies have restrictions due to political, fraud and other reasons.
http://www.itworld.com/it-management/315974/wordpress-accept-bitcoins-due-paypal-credit-card-blocks