Ironically, the latest release now makes the capability unnecessary: https://github.com/LizardByte/Sunshine/pull/4417
This PR adds a new "grab" implementation to use XDG desktop portals and Pipewire. There is a breaking change that comes along with this implementation, which is that KMS capture must now be started from a separte sunshine service named sunshine-kms. The main sunshine service now does not use extra capabilities defined by setcap.
edit: Never mind, the other service still uses the capability. It sounds like whether the capability is needed will depend on the capture method people are using.
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