Symbiotic relationship
https://www.bleepingcomputer.com/news/security/revil-ransomware-affiliates-partner-with-corporate-intruders/
Experienced network intruders and ransomware groups have struck an alliance helping each other monetize their skills by spreading malware to company networks.
One access-as-a-service provider works with multiple ransomware collectives, including REvil/Sodinokibi, offering them access to large targets.