The Hub4 doesn't do the hotspot sharing to my knowledge.
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Interesting, I have a *Hidden Network*, i.e. not broadcasting the SSID on 2GZ that is on the same channel as my network and appears to have a stronger signal than my actual network.
This is definitely from my hub, as when I power off the hub the Hidden Network SSID goes away and when I power it back on it comes back. Keep in mind that my hub is set to broadcast the SSID and also that the guest network is disabled.
I've mostly given up on the hub and will use it for cable modem mode, a new router is on order.