I bought two fat ebikes on Alibaba about a year and half ago, before the supply chain & shipping cost went to hell..
The fat tires are a bit overkill for pavement operation.
If most of your riding is done in mud, sand or snow the fat tires would make more sense.
On the pavement they are really noisy at speed, handling is rather vague, especially when you keep tire pressure low at 15 psi., that's great for off-road operation though.