I’ve been working on computeprices.com as a side project for the last year to do just that.

Not sure, but historically, AWS as far as I know has never raised prices on specific instance type usage like this. It makes sense that this would be the first attempt since it’s for apparently guaranteed capacity (vs the normal model of “if we’re out of capacity, too bad for you”).

That said, the real disturbing part of this is not so much the raising of the price for an extremely high-demand resource, but the utter lack of communication about it.