Jeff, I played with the WP 4.9.6 RC1 today, and I discovered that these privacy tools, can damage your SEO, unless I'm missing something.

So here are my findings. When a person's data get's erased by the core's personal data eraser Tool, the username used in the comments section gets renamed to Anonymous, (which I'm guessing the hacking group with that name will be ecstatic), and there is a link on all the Anonymous commentators, that point to https://site.invalid, which unless Google ignores this, will result with a number of broken links, if he has a number of comments. Am I wrong in assuming that Google will dearly punish you when this happens (having a bunch of broken links on your website)?