The amount of skill development required to even try something like this cannot happen without picking up a deep safety habit along the way. And that habit requires so much preparation to be satisfied for each individual free solo climb that the fast and loose fame and thrill seekers would be turned off, taking to easier, quicker fixes like e.g. BASE jumping.
It gets interesting when you look at the population overlap: more free soloists seem to die BASE jumping than free soloing. That says little about the "per unit" risk, because people can do so many more BASE jumps per year than reasonably prepared free solos. Risk mitigation for BASE jumping tops out pretty fast, risk mitigation for free solo otoh is an iterative process. They probably declare preparation done when they think that having a very rare deadly accident during preparation becomes more likely than having a moderately rare deadly accident in the actual free solo. (Now an on sight free solo, that would be an entirely different story...)
It gets interesting when you look at the population overlap: more free soloists seem to die BASE jumping than free soloing. That says little about the "per unit" risk, because people can do so many more BASE jumps per year than reasonably prepared free solos. Risk mitigation for BASE jumping tops out pretty fast, risk mitigation for free solo otoh is an iterative process. They probably declare preparation done when they think that having a very rare deadly accident during preparation becomes more likely than having a moderately rare deadly accident in the actual free solo. (Now an on sight free solo, that would be an entirely different story...)