That's probably the best case scenario honestly. They use our saliva and cure cancer. That's a great thing for humanity.

The other applications range from questionable to dystopian.. Making a database of everyone's DNA for law enforcement, data leaks and dark-web selling your DNA sequences, insurance buying the data to limit coverage after a claim, forensic genealogy as a way to catch criminals, using forensic genealogy to predict future offenders, targeted bio weapons, future tech like making clones of people, manufacturing fake evidence to plant, using genetic info to target certain types of people (race, gender, what if sexuality is genetic)