I found a number of questions discussing AGPL, but none really speak to the scope of AGPL. In practice, large providers such as Amazon provide AGPL software (e.g., MongoDB) and clearly do not provide source code for their full service architecture (i.e., we cannot self-host our own AGPL version of AWS).
Is there authoritative discussion of where the line gets drawn? My guess is that it's largely similar to GPL proper, where derived / modified works include programs that directly use AGPL code in their runtime. Likewise, I would assume work that runs in a separate process from AGPL software would not be under any obligations to respect AGPL.