Holy smoke, what a story! If I understood correctly, you've got an odd/incorrect rear triangle in your bike and Specialized is not willing to acknowledge their obvious fault. Unbelievable.
Wonder what the future will bring for that company. They seem to be writing a future bestseller, The rise...
I'll try to verify tomorrow, but I think the chain is "Shimano STePS CN-E6090 E-Bike Chain 10-speed". CHECKED & VERIFIED: I was wrong, the original Overvolt chain is Shimano "CN-HG54 10-Speed HG-X". Cheap Deore chain :)
I don't want to argue with you guys, if you destroy a chain per 400 km leg...
Come on guys, 500 kms is surely nothing for a chain, even on an eBike?! If eBikes would require new chain once or twice a month they would be practically useless, non? I don't know how much a typical forum user rides per week, but generally speaking I think it's not uncommon for an amateur...
Cool! Looks like a nice environment to ride!
Just a small advice: I recommend changing your Strava activity type to "E-Bike Ride" (Edit Activity->Sport), so it won't interfere with the leaderboards of std bicycles. Stealing std-bike-KOMs with an eBike is not something we should do, IMHO. )