>The AGPL only requires that you offer the source code to the "Corresponding Source"[1] of the AGPL licensed program
The entire definition of "corresponding source" in the AGPLv3 is identical to the language from the equivalent section of the GPLv3 (and it also includes the same "based on" language and section on aggregates) which is intended to apply to dynamically linked libraries, and it has been widely interpreted that way. If the software would be a single work as defined by the GPLv3 when distributed on a physical CD then it would be covered by the AGPLv3 when accessed over a network.
> the AGPL is not an "EULA" and doesn't apply to simply using software.
All GPL family licences are effectively EULAs because it's the GPL licence that grants the user permission to run the software, without that permission the user would be violating copyright by copying the program into RAM to execute it
>The only way Google's search software could be affected is if AGPL licensed code was added, which is why they have (with good reason) a policy to not do that.
The Google policy prohibits use or even installation. From the link:
>Do not attempt to check AGPL-licensed code into google3 or use it in a Google product in any way.
>Do not install AGPL-licensed programs on your workstation, Google-issued laptop, or Google-issued phone
As far as I know Google uses a single repository for nearly everything, which is why they are so keen to avoid AGPL code coming anywhere near it. Using AGPL code at Google necessitates "adding" it to the single huge google repo.