@phryk they were not built intentionally to boost specifically disinformation.
They were built to maximize engagement.
I can see how the disinformation boosting is a side-effect.
In that sense I don't think we need to assume intentional malice, and not assuming it simplifies the conversation for those of us who want to push for dealing with the underlying issue.
Of course the fact that once that became clear these companies did effectively nothing to fix it is damning.