Can’t really make apps for a site that doesn’t have an API. They did announce recently that Kbin’s API is nearly done, so soon there’ll be a flood of Kbin apps as well, and support for Kbin in all of the Lemmy apps too

and support for Kbin in all of the Lemmy apps

Very much doubt. I’m sure many will but not all. The API isn’t identical so they’d have to commit to maintaining both.

Yeah I suppose not all of them will want to commit to supporting Kbin, but some definitely will.

If nothing else, the Sync developer said he'd do it.

Memmy dev said they plan to as well but “not within this year” if I recall correctly.