Chains on an e-bike have to handle higher loads with the combined pedal power of the rider and the power applied by the drive motor. I use standard Shimano chains for 11-speed bikes on my e-road bike and have spare chains as I expect the chains to last half as long. The price has dropped for the chains by more than 30% from its pandemic price gouging level.

Over reliance on the bike motor going up hills is going to shorten chain life so I drop to the same gear I would use without the motor and go up the hills at the same speed.