It's starting to really look like the AI effect. It might be coincidence but I've noticed a lot more downtime and bad software lately. The last Nvidia drivers gave me a blue screen (last week or so), and speaking about Windows, I froze updates last year because it was clear they were introducing a bunch of issues with every update (not to mention unwanted features).
I like AI but actually not for coding because code quality is correlated to how well you understand the underlying systems you're building on, and AI is not really reasoning on this level at all. It's clearly synthesizing training data and it's useful in limited ways.
I think maybe it's not that GitHub is using AI, but that the amount of AI slop going into GitHub may be more than they expected.
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GitHub has been unreliable since before AI. Though it's definitely gotten far worse.
Seemingly the decline started with the Microsoft acquisition in 2018, and subsequent "unlimited private repository" change in 2019 (to match Gitlab's popular offer)