Google closes down, without apparent (and often without real) reason, many adsense and adwords. This is probably because of the sheer size of users of these services. I know 100s of people personally who have lost 10.000s to 100.000s of $ in revenue because of it while they still have no idea what they did wrong. In this case it's a bit more clear; whether I agree or not, I can see why they won't want you to offer that service.
I don't think any petition will get them to return on their stance here, but Google+ with a lot of influential people (from Google if possible) would be your best chance IMHO.
I don't think any petition will get them to return on their stance here, but Google+ with a lot of influential people (from Google if possible) would be your best chance IMHO.