Quad9 has a very aggressive blocking policy (my site with user-uploaded content was banned without even reporting the malicious content; if you're a big brand name it seems to be fine to have user-uploaded content though) which this would be a possible workaround for, but it may not take an nxdomain response as a resolver failure

Although, perhaps, having an external VPS with a dns proxy could be a good middle ground?

And it’s not conspiracy theory - it was very suspicious when we did some testing on small, aware group. The traffic didn’t look like being handled anonymously at Google side