When I want to install Public OAuth Proxy according to documentation , the syndesis-public-oauthproxy pod is not ready because the Image Stream oauth-proxy:v4.0.0 is missing.

In my POV, the process of how to enable Public API should be changed to process as addons use (Monitoring or Data Virt). As a user just enable Public API as addon.
e.g.

oc patch syndesis app --type merge -p '{"spec":{"addons":{"publicapi":{"enabled":"true"}}}}'