UK says it will store data not Google Apple

Government health experts in the U.K. rejected an app developed by Google and Apple that stores pertinent information on each user’s phone in favor of developing their own, which stores information about individuals on a central government server.

Why let 3rd party tech, or God Forbid, The People, store their own personal information, with the government not being able to obtain court/user permission, and/or without a warrant?