They trade with a large part of the world not in alignment with US/Euro thinking..
https://www.reuters.com/world/what-is-brics-who-are-its-members-2023-08-21/
Over 40 countries, including Iran, Saudi Arabia, United Arab Emirates, Argentina, Algeria, Bolivia, Indonesia, Egypt, Ethiopia, Cuba, Democratic Republic of Congo, Comoros, Gabon, and Kazakhstan have expressed interest in joining the forum, according to 2023 summit chair South Africa.
They view BRICS as an alternative to global bodies viewed as dominated by the traditional Western powers and hope membership will unlock benefits including development finance, and increased trade and investment.