I got one of these customer service breach emails last month actually! Hadn’t contacted Discord support in over two years and I’d completely forgotten what I had written to them about, which is its own kind of unsettling in it’s own right.
Logged into my Discord account specifically to delete the linked email address from my account, which is the closest I can come to making the leaked data point to nothing. Whether that actually does anything I’m honestly not sure. But it felt better than nothing.