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This is a collection of cases where someone seemingly had a large incentive to pursue a technology, and did not.
These are cases where incentives to pursue a technology were overcome by concerns about downsides not imminently accruing to the decision-maker (e.g. risks to distant people, ethical concerns). These cases are being collected via the Resisted Technological Temptations Project.
This is a non-exhaustive list of plausible cases. Inclusion on this list does not imply any degree of confidence.