Thanks for the clarification.
I thought you're original comment was saying something to the effect of "VCs funded HHVM, and this feels similar."
I'd only heard of HHVM in the context of Facebook, so I was surprised to read that (but I know Phabricator was another infrastructure company spun out of FB, so it seemed possible).
HipHop Virtual Machine was created over a decade ago to address serious performance issues with PHP. This spurred(lit a fire?) serious efforts to address the issues in PHP proper. Over a rather short period of time PHP became performant enough that HHVM was sunsetted.
I think the history here would call into question the viability of Bun as a monetary investment. It may end up a net good for the ecosystem , but if the major benefits can just be incorporated back into Node proper what are the ROI prospects?