From the Conversations for Health:

The Robert Wood Johnson Foundation (RWJF) funded this series of conversation experiences to understand the impact of simulated role-play conversations, featuring virtual humans, in managing conversations that make a difference in primary care and family settings. RWJF seeks to discover, explore, and learn from cutting-edge ideas with the potential to help build a Culture of Health.

The practice is common and raises privacy issues, but overall is beneficial, researchers say

From the GV Library description:

When designing for the web, you can analyze usage data for your product and compare different interfaces in A/B tests. This is sometimes called “data-driven design”, but I prefer to think of it as data-informed design — the designer is still driving, not the data.