Yes, you are the only one, because you've misunderstood.
> Most bugs don't come with their own updated alert text. It sounds a bit more like they had planned to switch to a different trial method and enabled it earlier than they expected?
No, the bug was simply that the trial period ended after 15 minutes instead of the intended 15 days.
> Or maybe a "rogue" employee added the feature as an experiment and didn't tell anybody?
There were no employees. At the time this happened, the company consisted entirely of the 3 cofounders. In fact the bug, that is, the shortened trial period, is what allowed the company to grow and hire employees, although the company is still relatively small.
> After 15 days, Audio Hijack will nag you to register at launch and will quit after 15 minutes.
Before the bug: after 15 days, the 15 minutes alert would start to appear.
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From the article:
> In version 1.6, we accidentally broke the intended 15 days of unrestricted usage. Instead, from day one, the app was limited to 15 minutes of recording.
After the bug: the 15 minutes alert started to appear on day 1