All three have published blog posts openly pushing back against FLoC, with DuckDuckGo releasing a Chrome extension that will block FLoC’s tracking. DuckDuckGo explains some of the privacy concerns over FLoC on its blog:
With FLoC, by simply browsing the web, you are automatically placed into a group based on your browsing history (“cohort”). Websites you visit will immediately be able to access this group FLoC ID and use it to target ads or content at you. It’s like walking into a store where they already know all about you! In addition, while FLoC is purported to be more private because it is a group, combined with your IP address (which also gets automatically sent to websites) you can continue to be tracked easily as an individual.
Brave, meanwhile, said it vehemently opposes FLoC, and any feature that’s designed to share information about users and their interest without first getting consent. Brave said in response to Google’s practices, it has removed FLoC in the Nightly version of both Brave for desktop and Android.Brave voiced its displeasure with Google’s methods:
It is disappointing to see Google, instead of taking the present opportunity to help design and build a user-first, privacy-first Web, proposing and immediately shipping in Chrome a set of smaller, ad-tech-conserving changes, which explicitly prioritize maintaining the structure of the Web advertising ecosystem as Google sees it.
Vivaldi has also said it won’t support Google’s FLoC, calling its new data harvesting venture “nasty” and saying it “harms user privacy.” The browser maker said it won’t support FLoC because it’s simply a privacy-first feature in disguise.“Google will continue to build profiles, and track users, in the absence of third-party cookies and localStorage,” Vivaldi said in a blog post. “It presents FLoC as part of a set of so-called ‘privacy’ technology, but let’s remove the pretense here; FLoC is a privacy-invasive tracking technology.”
Privacy advocates argue that FLoC will actually expose your data more than ever, not protect it, with Vivaldi claiming FLoC has “serious implications on a society as a whole.
If you’re concerned about Google’s FLoC, the easiest thing is to avoid Chrome altogether. You can use Brave or Vivaldi instead, or you can use DuckDuckGo’s Chrome extension or DuckDuckGo Search, which has been configured to opt-out of FLoC.