Mountain Project's About page includes this bit: > In 2015, REI acquired Mountain Project to solidify the future of this amazing resource for the climbing comm

Mountain Project's About page includes this bit: > In 2015, REI acquired Mountain Project to solidify the future of this amazing resource for the climbing community. Every line of code was redone from ground zero and traffic skyrocketed. In 2020, REI returned Mountain Project to its founders. And the site footer links to Adventure Projects, Inc. It looks like REI hasn't been involved since May 2020, and Adventure Projects was acquired by onX in December 2020.