Perhaps because they don't want to incur technical debt to a language/runtime that could change at the whim of one company that probably doesn't have other companies' best interests in mind?
The speed advantage of HHVM has also been largely erased. Some high-profile PHP sites migrated to HHVM before and up to ~2015, but I haven't heard of a single site doing that since PHP 7.0 came out.
> Perhaps because they don't want to incur technical debt to a language/runtime that could change at the whim of one company that probably doesn't have other companies' best interests in mind?
Go has been well received outside of Google. Wikipedia even has a list of companies known to use Go. I'm not sure how up to date it is, but the list includes Cloudflare and Netflix. At least some of them might have the oomph to fork, take over, or otherwise influence Go if Google ever dropped the ball.
Meanwhile, I can't think of any major online service that relies on Hack apart from Facebook and its subsidiaries.
But I agree with the original point about not fully relying on the whims of a major corporate promoter. Priorities can change within, without clear visibility on the outside.
The speed advantage of HHVM has also been largely erased. Some high-profile PHP sites migrated to HHVM before and up to ~2015, but I haven't heard of a single site doing that since PHP 7.0 came out.