veganbikes

Wearing out/breaking a chainring or chain or cassette cog is NOT covered under warranty. I tell my customers don't keep it in turbo mode and the harder gears all the time shift like a normal bike (as in not under load unless you back off significantly) and use the different levels more often. The problem with the lower cost drivetrain systems like the 3.0 and below is they really aren't great at handling the loads being put through by an e-bike and for commuters and regular riders and that isn't ideal. So the best thing to do is baby it a little more and be careful and then replace it with Deore or above and stick with more e-bike specific components. Also like with any bike but especially on e-bikes keep your drivetrain clean and properly lubricated and replace it regularly which for you and a lot of folks like you will be every 500-1000 miles or so.

Unfortunately with the Specialized spider other chainrings are hard to mount flush on it but potentially if you got a 104bcd to 110 or 130 adaptor (like TiCycle's sells) you could get a Surly Steel Chainring in 50t and have a harder gear at the front so you might spend less time in the 11t cog at the back. You would also want to replace chain with something like the KMC E9 EPT and a new cassette would be good as well. Luckily nice 9 speed cassettes still exist but you don't see them much OEM anymore as 9 speed has been mostly relegated to mid to low end gruppos and is going down as we march forward into 12 and 13 speeds. However with the nicer stuff and hopefully some better more thoughtful shifting and maintenance you might get a longer life out of things.

If you are wondering I do a lot of warranty work and sell a lot of Specialized e-bikes and have seen a lot in these past 5 years selling their stuff. If a chain/cassette failed in a short time not from poor shifting or damage caused by the rider then there is a potential for coverage. However this is just a worn out drivetrain used with likely poor shifting (under your own admission).