[giantrobot]

It also introduces a second order problem when the summarization algorithm is updated/changed. Anyone reading an article before the update can get one summary while everyone reading after the update can potentially get a totally different summary.

It's like when people talk about Google search results without realizing their search/browsing history has put them in a particular bubble. There's no guarantee any two people's result ranking will be the same which can affect their understanding or perspective on a topic.