Coinbase claims 70k users had data visible in this leak. That's an odd number to me. I've only found a few articles about this and a few random Reddit threads. I haven't yet seen an announcement or disclosure from Amplitude, but I would suspect others were hit as well.

Oldest article I found: https://finance.yahoo.com/markets/crypto/articles/coinbase-h...

Reddit thread: https://www.reddit.com/r/CryptoMarkets/comments/1xhlag5/coin...