GPLv3/AGPLv3 would still force Amazon and the like to share all the updates they make to the software itself, which is good for the software - forcing companies

GPLv3/AGPLv3 would still force Amazon and the like to share all the updates they make to the software itself, which is good for the software - forcing companies to be part of the software ecosystem - but not necessarily helping the (main or otherwise) developer. The elephant in the room here is that the usual OSS-as-an-offering model works from the fact that intimate knowledge of the software and visibility creates a strong market position for selling services (SaaS or consulting) that others cannot match. Whereas if "others" includes Amazon, GCP etc., their economies of scale and market visibility tilt the playing field in the other direction, making it harder for the OSS-as-offering model.