Linux isn't any more secure or safer than a lock on my door will prevent someone from just breaking the window. Hackers do in fact target linux machines, just not average desktop users. They typically go after servers since they run basically everything. And chances are, standard linux users know what they're doing so a ransomware attack isn't really much to frighten a linux user as much as it is to just piss them off but still recover in like 24 hours or less.