Competition. Lower prices. Better repairability.
Competition is great but it doesn't mean that the cars in America are bad. The lada was a failure of a car compared to other similar cars available elsewhere. That is not the case here.
The why part is easy - Tesla is about as outdated of a car as it gets, it is practically same car and there are only few options. I own 2014 Model S and my neighbour has 2025 Model S - it is the same car when you look at it. We also got Model 3 (from many years ago) which was then blown up a little into Model Y and we have X from a decade ago. These are ancient cars. The tech inside may have improved but the offering is basically for my grandparents now.