> Does this apply to all PPAs then or just a subset that are hosted on > Launchpad?
Aren't all PPAs hosted on Launchpad? The command to add a PPA is $ sudo add-apt-repository ppa:name/ppa where "name" is a Launchpad user. "PPA" seems to just be a name for the personal repositories that Launchpad hosts. You can have an independent apt repository (like jxself has for linux-libre) which would not be hosted on Launchpad and so would not be built on Launchpad's servers.
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