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The end behavior of build.ros.org was setup to follow as closely as possible what previously existed on the previous generation of the buildfarm.

The default to off is because they take non-trivial resources, and also send emails to committers. If someone spun up their own buildfarm, and just turned it on we didn't want everyone in the ROS ecosystem getting devel job emails from multiple buildfarms. So you need to turn it on when you setup your buildfarm.

For the pull-request builds, it requires action on the users part to turn on the hooks on github. And we also only have support for github. As such we would end up with a lot of permission errors if the @ros-pull-request-builder is not granted access, or it is any other git host. As we specifically do not require github for hosting.