Most companies don’t cooperate with law enforcement
All companies are still subject to the jurisdiction of their country. Perhaps you meant they are not voluntarily sending an unsolicited copy of every DNA profile to the nearest law enforcement office, but they still obey court warrants and extrajudicial subpoenas like National Security Letters.
Moreover, law enforcement doesn’t even need to submit an official request. The Golden State Killer was caught after police detectives uploaded his DNA to a personal genomics website in 2017 pretending it was theirs. The website returned a list of relatives, which police used to find the killer. This was all perfectly legal.
For sure, don’t go around killing people, but don’t rely on these companies to protect your genetic privacy either.