No, that was the old thing. People who already signed up still get that massive Azure credit. People who hadn't signed up yet but counted on that always being an option when they were ready are the ones who lost out, and they never got to experience the "gateway drug"*. Your analogy is closer to what they used to be doing: give companies a lot of free credits in the hope that they'll need to spend even more than that and continue to do it with Azure. They're probably canceling that as investors no longer provide towers of cash to burn on AI training, so there's less return on that investment for Microsoft.
* As far as I know, that's also not what "gateway drug" means. A gateway drug is one that people use first, but then abandon in favor of something stronger. This would be more of a free sample or even a bait and switch if it worked the way you described.