I’ve got a specialized Levo. I think the problem with people burning through chains is the fact you strain the chain a lot more by using a harder gear when climbing. Use the gears like a non electric mtb and the chain should last just as long as a normal bike.
I could be wrong. I am not a trained ebike tester, but it does seem easy to rely on the motor and launch yourself up a climb in a gear you would never use on a normal bike.