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Sounds like that's roughly the average usable lifetime for the battery, so you will break even on average.

I think most electric car batteries are still at over 80% capacity after 10 years usage, so hopefully you can use them much longer than that.

If you only cycle then in the 20-80% range, they'll last much longer (at least for NMC cells, not sure how LFP works).

I'd imagine most electric car batteries aren't fully charging and discharging every day. That makes quite a bit of difference in wear!

Tons of EVs these days are being made with what, 200-300mi range of battery pack with some internal buffer as well so they're never really going 0-100%? So what, we'll be generous here about the 20-80% and think 160mi of range used every day. That's 58,400mi of driving per car! The average US car does closer to 14,000mi. Being generous, that's 4x the wear cycles of a normal US automobile.

Roughly the usable lifetime? Based on what?

The battery linked in the article (https://eu.ecoflow.com/products/stream-series-solar-battery) advertises a 15 year lifespan and 10 year warranty. Personally I would expect batteries to last longer than that but 12 years feels fair

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