Mozilla uses the core protocol for Divvi Up for its privacy-preserving advertising. Brave recently wrote about why we disagree with the design of that system: https://brave.com/blog/mozilla-ppa/. The core difference is that Mozilla's system is a lot more complicated and expensive to operate, and it needs that complexity because they're trying to work with the existing third-party based advertising ecosystem and its enormous financial incentive for ad fraud.
Brave's DP system Nebula is not ads-related and is only used for product analytics, so it's a lot simpler while still preserving user privacy because it's not operating under the same constraints.
Thanks for your response, and the additional context! I wasn't familiar with the current use of Divvi Up for privacy preserving advertising. Honestly, my first impression was that it would be a good system for product analytics. It makes sense why Divvi Up is expensive in the context of advertising, but I suspect it would be more reasonable for analytics.
K-anonymity seems to have weaker privacy guarantees compared to the design of Divvi Up.
There was a Show HN about Divvi Up about a month ago, but it didn't get any comments: https://news.ycombinator.com/item?id=41141073
Anyone know how these compare?