a) You claim it is anonymous however you (or your providers, do they know you're running this?) are obligated to record appropriate identification information as part of the Australian Telecommunications Act (and it's associated Interception ones). How will you address this when receiving an information requests from the Australian Federal Police?
They will record personal info for those who contact with them directly. After that, it's free game. No info/Little info which could be easily forged is needed. If Police contacted the provider, I simply doesn't care. Best thing they could do is to unplug the server, which could be easily fixed within days.
b) Bandwidth in Australia is obscenely expensive by comparison to essentially everyone else. You're either offering this service with a poorly structure business plan or overselling your bandwidth from your exit points calling into question the viability of the platform for VPN services. Do you oversell bandwidth?
Stuart
I didn't manually limit the bandwidth of my customer. Plus, not many people choose Australia VPN. You could choose servers in other locations e.g. U.S in case you fear the bandwidth in Australia.