The GPLs (excepting AGPL) only require release of source code if it is distributed outside the company/person modifying it. It comes from a pre-networked time w

The GPLs (excepting AGPL) only require release of source code if it is distributed outside the company/person modifying it. It comes from a pre-networked time when most software required distribution to be useful. Setting up a web service with GPL code doesn't meet the bar for distribution, so that situation does not require the code to be made available. That's what the AGPL addresses, network use triggers the requirement to make the code available.