Not sure what kind of money you got, but for me S3-storage costs about 0.6USD/30GB*month. Multiply this by 100 and you got a bill of 60USD/month - which is not much if you are a cash-bloated startup but not really sustainable for a bootstrapped, non-exponential (that's the point when you're talking about challenges like climate change. stop growing) business, which want's to survive on user donations, once you reach several thousand users. If you got the really cheap stuff from online.net, I recommend you don't raise any hopes in Google-scale availability...