Oh come one, we all knew this right? I spit in the tube knowing they'd use it for drugs, sale or some other research shit. They also feel like they made this pretty clear throughoit the process that they'd use your spittle for science.
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)
One things missing with most of the those: profits. I'd be more worried about bad actors stealing the DNA data and using it for all those. The businesses will keep within regulations to keep the profits rolling in without getting shutdown.