They are never going to significantly prioritise “public” cloud resource over internal needs, beyond own needs having quotas to make sure they don't run amok if

They are never going to significantly prioritise “public” cloud resource over internal needs, beyond own needs having quotas to make sure they don't run amok if something gets unexpectedly out of shape. If their own public services slowed down in high demand times, it wouldn't look good. The sales channels could try to spin it as “giving you priority over us” but who would genuinely believe them. They could reduce resources available to low priority internal stuff during spikes of other activity, but that would not have a large effect considering the combined size of activity on the public cloud resources.