So far this contagion concern hasn't actually played out, and big corporations/hyperscalers are often using AGPL software somewhere in their stack if they're using common Linux distros - and nothing thus far has been compelled to be open sourced that isn't AGPL software.
This might be insightful about the concerns as well as why lawyers still think it's straightforward: https://www.opencoreventures.com/blog/agpl-license-is-a-non-...
https://discuss.logseq.com/t/on-the-agpl-license-and-the-ide...
https://writing.kemitchell.com/2021/01/24/Reading-AGPL
(not a lawyer): https://drewdevault.com/2020/07/27/Anti-AGPL-propaganda.html