Mine is a DIY conversion of a cheap Walmart clearance fatbike, but it's just like a Radrover with similar 750W motor in the rear. I put on better, lighter tires, and being DIY it has no speed restrictions. I added a front derailleur to facilitate pedaling unpowered, one of the few fatbikes with 21 speeds. I once had two hub motors for 2WD, but re-discovered that snow sucks. I only have the rear wheel powered now. It's 62 pounds, just about what it weighed as a non powered bike. There was a lot of steel bits in it originally, The frame is steel and all that remains of its Walmart heritage.
A fatbike would need fenders for rain/snow. The knobby tires will toss it in your face and down your back. Otherwise, a fatbike probably makes a nice commuter. They usually have enough power. Comfy, visible, big and fast. I think snow sucks and commuters have to deal with ice under the snow, That means studded tires in my opinion. If you have that, I think a mountain bike/hybrid style will work just as well and is more versatile as an everyday bike and less attention grabbing to thieves.
I should add that I ride for recreation, mostly on paved paths although there's many loops with grass and gravel. A lighter bike makes more sense for me when I'm just cruising, I only use m fatbike about 5% of my rides,
