"The joint American-European project is expected to cost billions and take just over a decade to implement." This doesn't exist. It's never been done before. I

"The joint American-European project is expected to cost billions and take just over a decade to implement." This doesn't exist. It's never been done before. If SpaceX does it before Airbus and brings back literal tons of mars rock then great, but it's not certain when that will be possible. Market viability isn't an appropriate metric for scientific research.