The dialogue programs

All three were written to be good enough to be believed, and the belief was studied as a phenomenon rather than treated as a bug.

Application. One-sided attachment put to work on purpose. Creator economies, community, fandom as infrastructure, and the things that genuinely help people. Not automatically good - a tool with an obvious use is a tool that will also get a bad one.

Consideration. The part where somebody stops and thinks. The research, the diagnosis, the ethics, the lawsuits, the regulators. Roughly fifty years of arguing with itself about whether this is a relationship.