The Switchbot Hub is the control centre for all Switchbot devices in relation to the internet and other Smarthome devices such as Alexa. So yes, I have about 10 Switchbots, a few thermometers, motion detectors, a curtain and all attached to the same Switchbot Hub (you only have to activate the "Cloud Service" per device in the APP, the rest happens automatically. Or, when setting up a new device, it already asks you during the setup if you want to connect to the hub, if it already sees a hub nearby).

All in all, this is by far the best working solution of all smarthome ecosystems (and I have a few like myStrom, Ikea, Amazon Alexa etc.).
I recently connected a Switchbot & a Switchbot motion detector to the hub at home, set everything up & tested it, then drove to my parents' house, but there's no hub there. With other manufacturers I would have had to reset everything to factory settings (if at all possible, part of it is extremely tedious, just configuring a new WLAN). And then teach it all over again and set everything up.

With the Switchbot app, on the other hand, briefly deactivate "Cloud Service" on both devices and then set the motion detector as the trigger on the Switchbot (the app already suggested it automatically because it noticed that only these two devices are within Bluetooth range).
And voila, everything works with the old config! I was really surprised how brilliantly it works.