Google is going it alone with its proposed advertising technology to replace third-party cookies. Every major browser that uses the open source Chromium project has declined to use it, and it’s unclear what that will mean for the future of advertising on the web.
Here are some of the comments from major browsers:
“The worst aspect of FLoC is that it materially harms user privacy, under the guise of being privacy-friendly.”
“We will not support the FLoC API and plan to disable it, no matter how it is implemented. It does not protect privacy and it certainly is not beneficial to users, to unwittingly give away their privacy for the financial gain of Google.”
I'll let you read the other browser developers, including Apple, for yourself. TL;DR There appears to be a resounding lack of support for Google. I think that's probably fine.