Not that I'm a particular fan of Amazon or Bozo, but the only gaming of the system here appears to be from Trump.
When they first announced they were looking for a single vendor AWS were far and away the obvious choice, just because they're better at the clouds than Microsoft. The waters then got muddied when Trump and one of his moronic spawn started spouting off about it because the Washington Post keeps winding them up by printing true things about what a pack of cockwombles they are.
Not sure how you think AWS/Bozo "gamed the system", unless you consider them to have unfairly and despicably rigged the entire process by producing a better offering than MS and then, like the underhanded bastards they are, offering to let people use it.