I think a far more robust solution would be spreading our species into multiple planets/solar systems, which are far enough that there is little incentive to co

I think a far more robust solution would be spreading our species into multiple planets/solar systems, which are far enough that there is little incentive to compete with each other. (Think a generation ship kind of concept). These civilisations communicate with each other, but specifically treat each other as test beds for their technology. So if plant A invents technology X, it will send a message to B saying: "I invented such and such, and will let you know in 50 years on how it went". B will then not adopt that technology until it hears back about how it worked out for A.