Is radon mitigation affordable, though? Someone in another subthread said they got quotes between $1600 and $3000. Even the low end of that is a difficult amount to spend for a lot of people in the US. If they're going to spend it (if they even can), they're going to want to know it's going to meaningfully decrease their risk of cancer.
I'm not saying it's not worth it -- that's the point, I don't know -- but I agree with people upthread that it would be nice to have better information with which to make decisions.
I don't know where you live but where I live in the Midwestern suburbs, $3k is on the low end for almost any significant home improvement/repair project except maybe repainting a room.
It might be significantly cheaper if installed in new buildings. Even if not, it barely moves the needle compared to the total cost of building a house, and it's almost nothing spread across the lifetime of a typical building.
I'm not saying it's not worth it -- that's the point, I don't know -- but I agree with people upthread that it would be nice to have better information with which to make decisions.