Google AJAX APIへのパラメータに エンドユーザーのIPアドレスが追加されたらしい

Google AJAX APIs Blog: New Parameter for Server Side API Calls

To help us discourage this behavior without affecting legitimate developers, we're adding a new parameter to the RESTful interface, userip. With this parameter, developers have the option of supplying the IP address of the end-user on whose behalf they are making the API request. Doing so will help us distinguish this legitimate server-side traffic from the more abusive scraping in which there are no end-users.

Use of this new parameter is *not* required. However, if it is not included with server-side requests, those requests are more likely to be interpreted and automatically blocked as abuse, especially in situations where a server is sending a high volume of traffic to the API. Additional safeguards you can take include setting setting a valid HTTP referer (as required by our Terms of Use) and using an API key. These additional measures will help us contact you in case there are problems with your website or application (sometimes a programming error results in massive traffic, forcing us to block your access if we are unable to contact you). In choosing to utilize this parameter, please be sure that you're in compliance with any local laws, including any laws relating to disclosure of personal information being sent.

サーバからの過度のアクセス対策らしい。IPアドレスを送らないなら、リファラかAPI KEYを送れと。でないとブロックするかもしれないよと。

でも必須ではない。
もしブロックされるケースが増えるのでなければ、ブロックされた場合の回避手段が増えたというところか？
.