Bun is effectively dead.
Anthropic bought it in a somewhat dumb attempt to solve their "performance" issues (not realizing their horrible code was the issue in the first place).
It probably helped them, simply because they brought in some actually competent developers.
But doing so, Bun went from being a public project to more of an internal tool for Anthropic, spoiled for now with AI money and losing quite a bit of focus.
Let's hope that when the bubble pops, some of the Bun effort could at least be salvaged. I don't see Anthropic maintaining it long term, they are simply not in the business of selling support for a runtime nor have the (Google) scale justifying maintaining one on the side.