>>13827981DNA exposes way more information about you than what you think. how likely you are to be violent, how likely you are to like certain foods, your personality, diseases you are susceptible to, a rough estimate on how long you will live, your career, your intelligence, your political views, etc.
if all this information + what they already know (address, income, health, etc) is gathered in one database then they can literally know about you more than you know about yourself.
what do you think all these huge datacenters are for? for now it's only used in helping investigations and ads, who knows what it will be used for later? even if it isn't used for other purposes later it's still a breach of your privacy. do you want a data center to know that you have a micropenis, jerk off to tranny raceplay porn and recommend you dick pills and "love in Thailand" all the time?