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Most EV manufacturers are offering around 8 year/160,000-200,000km warranties on the batteries.

So not 200,000miles. But definitely covering the average usage pattern.

And not all will last that long, but the majority will. And potentially the worst case is just degradation - I.e. 200km range instead of 400km range, so still quite useful for a variety of use cases even outside of cars.

Yes, current EV batteries (not the old Nissan Leaf ones without active cooling) are projected to last as long as 3 million kilometres: https://youtu.be/7DYknTVskTw?t=325

https://www.greencarcongress.com/2019/09/20190927-dahn.html Dahn’s “million-mile battery” detailed in open-access paper in JES

Warranty is to some percent of original capacity, like 80 or 90%. Then you have another few hundred thousand miles for the next quantum of degradation.