What Radix does has no impact on Google, and I don't see how Google would be incentivized to pressure Radix. So I don't see how to make the leap blaming Google for Radix's incompetence. Yes, Google should recognize the risk of this happening, but they'd have to balance that against the rewards (or at least what they consider rewards)
I had my main family domain put on Google's safe browsing block list and it has a massive impact. No one can visit the site. I think apps using system browser runtimes (ie: mobile) may stop working. I've seen reports that it can impact email deliver-ability. And, now, we see that it can get your domain put on serverHold so the problem becomes impossible to rectify.
Google should have to pay for the damage. In my case, it was about 4h of work to figure out what was going on and how to fix it, so not much, but I've seen small businesses that rely on their primary domain to drive most of their sales via web and email. In those cases, having your domain placed on server hold because of Google's false statements can have a serious, detrimental financial effect.
But my point is that any knock on effects like domain suspension, email deliver-ability, etc. stem from 3rd parties misusing the safe browsing list outside the scope of safe browsing.
I don't see how Google can be blamed for other companies erroneously treating the safe browsing list as a source of truth for generally malicious domains
That's fair and I agree. My opinion is that both should be liable in a case like this. If I had to attribute it, my starting point would be that Google is liable for the loss of website traffic and the registry is liable for the loss of email and all other lost services due to the domain suspension.
It spirals though because, like you pointed out, no one forced (ex:) Mozilla or Apple to adopt the blacklist. They did that voluntarily, so they should be responsible for their share. That's why nothing ever gets fixed. It's broken, but there's so much potential for finger pointing that no one gets pinned down and held responsible.
The answer is always the same IMO. Break up big tech companies into a million little pieces.
Google should not have known that someone would misuse their block list to block domains. But now that someone is misusing their block list to block domains, if someone brings it to their attention, the next time this happens, they will have known it.
I am not a lawyer, I am not your lawyer, and this is not legal advice.