Speaking for myself and in my role as WICG chair, not speaking for my employer.
James, as previously mentioned, the bar for getting IN to incubation at the WICG is intentionally low - that is, there must be SOME industry support. Note that this is actually a HIGHER bar than for the W3C’s Community Group system as a whole, where one merely needs five people (even from the same Member) to start a whole new community group. Incubations are not intended to represent (to counter the point you have espoused repeatedly) a “done deal”; indeed, they are open exploration, so that multiple parties CAN participate in developing solutions.
The bar for starting a Working Group, Interest Group, or moving a specification from a WG to Recommendation status is, of course, much higher.
Stating things like “the overriding feeling among many is that Google has largely ignored the feedback provided by industry and business stakeholders” as if it were fact seems very much like saying “many people are saying”; without data, it’s impossible to objectively find solutions. You don’t like our solutions; great, please participate and try to actually solve the problem of providing marketing tools that do not need to violate users’ privacy. We are actively trying to seek common ground, while you appear to simply be against putting users in control of their own privacy, and attempting to block any attempt to incubation and find solutions that might address the raft of privacy concerns that permeate the Web today. As I have previously stated, blaming Google for the need to find user-privacy-centric solutions to marketing is a red herring; the market (and the other browsers, who have ALREADY made the changes you are attacking Google for) have already spoken on the need to find better user-center solutions.
Your raising of the spectre of anti-trust seems misplaced, as the pointer you yourself provided in your article makes clear the need to have open collaboration - which your attempt to block discussing FLoC or other privacy-focused tools for marketing would, in fact, prevent.