High reliability is routine these days, as are e-banking and share dealing websites etc. -
www.schwab.com is a good example of one that routinely processes tens of millions of shares a day without problems. Nothing wrong with that, but it costs. A lot. For Amazon, Yahoo and any e-Banking/e-Trading business these costs are essential - no website, no business - but I suspect AIS would choke if you told them the cost of the hardware, software and people to do it. The problem is that we are now getting used to what a good eCommerce website can do, so we expect it all the time.
We had an interesting project going with FFF's former employer to feed their traders information in real-time, anyplace, anywhere and to process their response. Reliability was critical, as they it would cost them millions if a link went down and a trader was left holding options he didn't want, and the cost was well into 8 figures (USD, not Lira
). That's the sort of money Amazon
et al. spend too....