Sure. And so has the IRS, which “persuaded a federal judge”, according to the article.
I guess they thought it was a reasonable request to get the data of the 25,000 US citizens who made significant profit with bitcoin in those years, when only a few hundred reported such earnings in total.
It's not just a matter of tracking those that cashed out as taxes are on the net profits of individual trades. Even converting between coins (ex: sell BTC, buy ETH) is a taxable event.
The 4th amendment does not prevent combing through public data (the blockchain), nor does it prevent going through due process to obtain data (the coinbase order).
I guess they thought it was a reasonable request to get the data of the 25,000 US citizens who made significant profit with bitcoin in those years, when only a few hundred reported such earnings in total.