The verb "to venture" has the following meanings
1 : to expose to hazard : risk, gamble
2 : to undertake the risks and dangers of : brave
3 : to offer at the risk of rebuff, rejection, or censure (venture an opinion)
: to proceed especially in the face of danger
ven·tur·er \ven(t)-sh(-)rr\ noun
These definitions seem applicable to what cryonicists do, especially because we defy fear of the future
, and we persevere in arguing for, and practicing, cryonics "at the risk of rebuff, rejection or censure."