Yes and people who come by asking about a connection error are just going to be directed to contact Blizzard and have the thread closed. Yeah we may not be able to prove every single little detail, but at the same time we can enforce several other things.
For one contacting the people who are in charge of the Beta and its services. Another would be to use their forums for support. We are here to help and for information purposes, but if we dont have anyone else who is in these betas, how can we help? The topics would be for information purposes only and not for support as we couldnt give support since we wouldnt have access to test it ourselves.
So yeah, there is ways around it and yeah there are things that can be done to bypass even our best efforts. But at the same time we can do things that protect us as best as we can. Will we catch everything? No. Are we trying to catch everything? No. It is not possible to be perfect. But we can do our best to stop what we can.