PayPal is an international e-commerce business allowing payments and money transfers to be made through the Internet. Online money transfers serve as electronic alternatives to paying with traditional paper methods, such as cheques and money orders .It is subject to the US economic sanction list , and subject to other rules and interventions required by US laws or government.
SILO.PUB provides versions: Pro, Gold, Platinum and Enterprise. Pro version and Gold version are monthly paid plans and you need to pay monthly; while the Platinum version is an annual plan. And the Enterprise version is a one-off payment plan, you just need to pay $999 and you can use it forever.