I thoughts so , or maybe google dont like anything French ( i'm kidding of course ,they bought sparrow ,didnt they ? ) , but strangely Haxe has been trying to participate the google summer of code for years but was rejected everytime.

I dont think it is a bot problem , there are a lot of unofficial symfony groups on ggroups.

My 2 cents :

- redirect people to stackoverflow in the mean time.

- build your own Q&A. I know it's a bit of work , but why not build an open-source symfony Q&A project ? i'm sure you could get support from any PAAS provider for free to host the app. Make it accessible through RSS so people can suscribe it.