Because Google engineers think that they are the smartest people in the world which means they don't actually engineer for minimization of a blast radius. You

Because Google engineers think that they are the smartest people in the world which means they don't actually engineer for minimization of a blast radius. You should just see how Google builds the prefix lists that it allows customers to advertise to Google via PNIs. You would think they are building it off some registry lists because why else would Google insists that the routes are registered? Oh no, that's for small people. At Google they just bring up a session to you, let you advertise and take whatever you advertised to them during the setup as the allow list because everything is done via custom automated software!