Reading Alby's documentation it looks like Alby Hub gives you the option of connecting to your own node or using their Alby Cloud service (see screenshot from one of their videos).

Hub itself isn't a node; it looks more like a...wallet and connection interface? It looks easier than assembling a Bitcoin stack from scratch, but more self-sovereign than exclusively using something like CoinOS (I do use CoinOS [and love it], but not exclusively).