According to Atlassian recommendations: https://www.atlassian.com/blog/developer/building-secure-and-scalable-integrations-our-guidance-for-third-party-apps, a single app for OAuth 2.0/3LO is recommended; however, Bitbucket Cloud doesn't support 3LO apps.

Suggestion

Add a feature to Bitbucket Cloud to support 3LO apps, just like Jira and Confluence Cloud.

Source: https://developer.atlassian.com/cloud/jira/platform/oauth-2-3lo-apps/