uses Bluetooth to track proximity between the user's phones and notifies anyone who has been in vicinity of someone who tested positive (there is an interesting story here on how they had to first overcome the issue of varying Bluetooth strength based on phone models)
does not collect personal information (a consent is needed upfront)
does not capture GPS data
installed by 620,000 users (as of 23 March) which is roughly 11% of Sin... (read more)
Here's some contact tracing discussion on reddit, you might want to post there/contact individuals there:
https://www.reddit.com/r/Coronavirus/comments/fksnbf/im_bill_gates_cochair_of_the_bill_melinda_gates/fkuoxbi/
3Jeffrey Ladish
Government and tech companies / tracking
https://www.wsj.com/articles/to-track-virus-governments-weigh-surveillance-tools-that-push-privacy-limits-11584479841
Palintir already helping government track cases -- Article notes that government can get location data from telecoms, but that google has even more precise data from maps and android, which the government can also ask for in an emergency