Is this just to plug the site? What's unique about this, there's quite a few others already?

Aren't most Show HN's plugs to whatever they're presenting?

I mean, sure but I think it would be helpful to explain a couple of things.

How it was decided which vendor is an alternative, what were the criteria etc

How can this be kept up to date?

Can I submit missing data, if so how?

This isn't unique at all, so what sets this one apart from the others?

If you turn on showdead, you'll see OP's explanatory post.

	▲	defrost 3 hours ago \| parent \| next [-]
		Hard link to [dead] comment: https://news.ycombinator.com/item?id=47624742 [vouch] for comment, if you have that option, it got caught in the noob green comment auto-flag filter (that is easily triggered). EDIT: now undead.
	▲	hvb2 3 hours ago \| parent \| prev [-]
		Interesting, didn't know that existed... I would've still put it in the submission itself but that makes sense