One of the things that stand out to me is would Google still invest such dev resources into chromium? If they have no incentives to do so, because it's not coming downstream to a chrome they own I doubt they would invest at least as heavily. Will Microsoft take up that slack for the sake of edge? Or brave? Or ark?
CrUX could theoretically become a service you pay to access, Google being one customer I suppose. But I do question how viable that would be.
I don't think many site owners would pay for it directly, when they're able to collect nearly the same data directly with browser APIs.
It's interesting that folks don't shout about Brave's use of their browser to do all the metrics and measurements, and indeed they actually _DO_ use it to off-load their crawling too, (something whilst they don't exactly hide, they don't exactly shout about either). But I guess that's also because they are far from the dominant position Google are in.