«Система передачи финансовых сообщений: 557 банков и компаний, из них 159 нерезидентов из 20 стран», — говорится в материалах.

а использовать начали или только "подключились"?

Alternatives to the SWIFT system include:

1. CIPS: sponsored by China, for RMB related deals. 1467 financial institutions in 111 countries and regions have connected to the system. The actual business covers more than 4,200 banking institutions in 182 countries and regions around the world.^[58][59][60]
2. SFMS: sponsored by India
3. SPFS: developed by the Russian Federation^[61]
4. INSTEX: sponsored by the European Union, limited to non-USD transactions for trade with Iran, largely unused and ineffective^[62][63]

As of 2018, around half of all high-value cross-border payments worldwide used the Swift network,^[9] and in 2015, Swift linked more than 11,000 financial institutions in over 200 countries and territories, who were exchanging an average of over 32 million messages per day (compared to an average of 2.4 million daily messages in 1995).^[10]

https://en.wikipedia.org/wiki/SWIFT#Competitors

вообщем - вы изобрели колесо , интересно - покатиться ли ... но 20 стран - это серьезно