There’s also just no real incentive for them to do it. The number of devices running fully de-googled Android forks are miniscule in the grand scheme of things. Everyone running devices with non-standard Android but which still uses Google Play Services and the rest are just as valuable to Google as the ones running stock. And it suits Google to have the small ultra-privacy hobbyist market still running Android forks, even de-googled ones, rather than moving on to something else entirely.