It is my understanding that the only difference applies to hosted software. For example, Lemmy is AGPL. If it were GPL, then a company could take the source code, modify it and host their own version without open sourcing their modifications. AGPL extends to freedoms of GPL to users of hosted software as well.
A real example of this would be truth social which is modified Mastodon and as AGPL those modifications are required to be open source as well.
Yeah I’ll willing to give them the benefit of the doubt on this one. Could very easily believe that a dev added the reference without realising the implications and they fixed it very quickly. Will be watching for any future attempts though.