>By using this, It gets your IP because you have to sign into Google
If you're already signed into google then they already have your IP. If you're not signed into google they continue to not get your IP or proxied traffic. What's the issue?
>But other advert platforms don't get your IP
No good deed goes unpunished. Google gets flak for making chrome privacy better, but they also get flak for making chrome privacy worse (see comments about fingerprinting in this thread).
Sounds like this is just another attempt by Google to gather the data for itself but make it harder for other advertisement companies.