I think there is probably a record breaking class action lawsuit here with the right lawyers. Damages could be 50-100% of Google's yearly gross revenue, especially when you include countries outside on the US who really don't like Google.

Google intentionally modified both geo-targeting and mobile app targeting, removing the options advertisers set. For example, you opted out of mobile app targeted. Then they removed the option and you had to set it in the domain blacklist. Then they removed that. This wasn't a one off, hid, modified, and moved these options repeatedly.

Advertisers didn't know that when you geo-targeted a location, by default it was set to users searching that location. You didn't want people in India who were interested in NYC? Too bad.

Remember the whole Adwords prescription drug settlement. This is an organization run by people who would be serving hard time if they didn't have a legion of lawyers and bottomless pockets.