Curious--are you saying you changed it? If so, why?

GP is not OP. HN has a try not to editorialize titles rule, so GP was pointing out the title was changed:

"Otherwise please use the original title, unless it is misleading or linkbait; don't editorialize."

https://news.ycombinator.com/newsguidelines.html

Not sure why the title got changed, "MongoDB acquires mLab" seems to make more sense.

We've reverted it to the original from “MongoDB acquires a database Hosting company”.

Makes sense. Then I agree with the parent comment. Odd change made here

Yeah sorry, I was pointing out that the original title was different than the posted one (due to the HN guideline as explained by ibotos). Also it included the name of the acquired company.