What’s the incentive to mark yourself as COVID-19 positive?
In the Apple-Google and Decentralized Privacy-Preserving Proximity Tracing schemes, an infected user has to mark themselves as infected. But by that point, the user has had all the benefits the app can provide; they face nothing but potential costs, e.g. potential loss of privacy. What stops people from being “free riders” of these systems?
The incentive is to help and inform other people, to allow for targeted testing and so, one hopes, mitigate disease spread.
Altruism is the bottom line.