So why do water heaters leak at all. I have a 100 year old furnace in my house (Hot water, originally coal fired converted to natural gas). It doesn't leak so why should a 8 year old water heater?
Because it was made 100 years ago. Those furnaces were built like tanks. Gas and electric water heaters leak all the time, ask anyone (including me) who has come home to a flooded basement.
Now I don't know for a fact exactly how much bandwidth I was using. I am basing the 10 terrabytes on the published news stories. Perhaps I was using nowhere near that, and Verizon has not been forthcoming about the limits (at least not to me) so maybe it really was just about Tor.
I'm not a math whiz when it comes to computing bandwidth, but it appears to me that 10tb per month works out to an average of 4Mbps over 30 days so that's definitely something that could come just from Tor relaying when there is no bandwidth cap set up in Tor.