The damage caused by DC charging is not huge. If you supercharged your car every day in lieu of home charging (i.e. because you can't home charge), then the effect is bigger, but Tesla superchargers (can't speak for the others) are very careful about how much charge they dump into the battery at any particular instant given the battery's current state of charge, temperature, age, etc. They do this specifically to preserve the health of the battery.
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