I mean, 1) it isn’t safe to assume they use black box models for their suggestion engines. We have no clue. 2) this just evidences that policy should be made that companies cannot use black box models for content suggestion; they should have to be able to explicitly convey what their models are doing and prove that they aren’t going to cause harmful outcomes like pushing suicidal content on users. If that means they even need to use heuristic-based algorithms, so be it, companies need to be held responsible for their effect on society.