It's not a bad outcome. Bun is cool but has $0 revenue and some hand-wavy thing about future paid cloud services. This way, larger companies will give them a more serious shot than they would a small startup.
It still doesn't have a revenue story, but it's now strapped onto the side of one of the few AI companies with a decent chance of surviving the next AI Winter. And if Anthropic goes sideways, the Bun engineers can fork the code and keep going.