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Hertz Is Selling 20,000 Used EVs Due To High Repair Costs
(arstechnica.com)
This is a most excellent place for technology news and articles.
Note that Tesla, specifically, does not allow any third-party repairs. They simply don't make the parts available to independent shops. They are very much like Apple in this regard.
From my understanding, EVs from Chevy and Ford follow the same model as their ICE models. You may have difficulty finding independent mechanics that can work on their EVs, but it's not because the manufacturer is freezing them out.