@numericcitizen @manton (my guess before Manton answers: something to do with HEY being more open to such a feature, as opposed to the many alternative platforms that are mostly locked down)

From a feature POV, I like this idea. It makes sense since HEY isn't trying to be a full hosted blog, at least not yet by the looks of it; rather they favour using email or RSS to read the posts, whilst your Hey World posts are listed on more of a profile than a full site.

As such, if you like both Hey World and Micro.blog, and then sometimes wanted your Hey World posts to also be hosted somewhere with greater permanence all you would have to do is select Micro.blog for the direct copy-post solution. Makes sense especially when you consider the substantial prominence given to custom domain culture on Micro.blog.