Thank you for your interest in Google Web Accelerator. We have currently reached our maximum capacity of users and are actively working to increase the number of users we can support.

Source: Google Web Accelerator Web Site

I think there is much more to it then they are letting in. When GWA debuted there was no hint about such limited resource availability for this project. The fact that Google has targeted this product for broadband market indicates that they have allocated a fat pipe (bandwidth) for this project. Never before have any Google project terminated for end-users midway. They have limited users from start in GMail or Orkut; but this is different. They changed mind within few days after debut, closing doors to new users.

Google Web Accelerator is beleaguered with problems from start. For starters it serves one's cookies to others (allowing access to web sites with undesired privileges at several sites including but not limited to phpBB), it artificially loads web servers by assuming demands and for sure it totally messes up your web analytics. Several web applications reported accesibility and security problems with GWA.
For the end user there are significant privacy concerns. Several web sites are starting to block GWA users.
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