Goodbye FLoC, hello Topics

Do they care? Chrome has the market cornered, can't run their own engine on iOS anyways (where Chrome is least-used by platform), and can therefore put out whatever standards they want and know that "most" users will have it available in a few weeks of deployment (more or less). Sure, iOS isn't going to get it as nicely as others, but Apple gives everyone a laggard engine anyways, so any new feature is going to take time there no matter what. What kind of response do the other browser vendors have that would make Google care about dropping this kind of functionality (however they market it)?