It has nothing to do with security, Google Safe Browsing works fine without it and you can even use it with alternative DNS services.

It is literally just so Google can see everything you do, type, say, etc and it you also give it consent to alter, for your protection.

Like when it was enabled, it filtered out rt news links, literally removed it from emails and messages, as if they never existed.

What is illegal and immoral changes daily, so it is not just about that particular example. The point is that they can do it.