Yes, we all read the article. The question is not how does Microsoft's free giveaway compare to that of AWS' -- it's, how much will that cost you in three years, once you've committed yourself to using those resources. What are you going to do after that, sign up again with a different email address?
Azure is completely price-competitive with AWS. In fact, AWS and Azure seem to be in a pricing war, lowering their prices anytime the other one does. They're both far cheaper than Rackspace.
...and seriously - you're worried about pricing three years from now with a startup?
You see, 3 years is a long time to grow and a startup where the co founders are developers, I hope we can get enough revenue at least to pay the server bills!