They got all the dabs they need, there is no point to them anymore.
Bingo. Their business model was never to sell data to DNA sample submitters. Their business model was to sell submitters' DNA and RNA data to korporations and governments. In addition to their own collection efforts, the korporations and government collected data from COVID-1984 swabs.
Once the korporations and governments had all the dabs they needed, '23 and me' had no more customers.