Bitcoin traders can breathe a sigh of relief. If JPMorgan Chase & Co.'s CEO Jamie Dimon fires them for trading the cybercurrency, Goldman Sachs Group could welcome them with open arms.

Goldman is reportedly considering a new operation dedicated to buying and selling digital currencies. Goldman would be the first large Wall Street firm to explicitly have a bitcoin trading desk, and the news seemed to legitimize the currency less than a month after Dimon called it a "fraud" and said that he would fire anyone stupid enough to trade it. Indeed, prices of bitcoin, which many people already thought were in a bubble, rose $193 on Monday to $4,365 each. That's up from $952 at the beginning of the year, for a staggering 360 percent return in 2017 alone. The S&P 500 is considered to be having a great year. It's up 15 percent, including dividends.

But traders may be reading too much into Goldman's cybercurrency move. Remember mortgage-backed credit-default swaps? Goldman had a dedicated unit to trading those as well. What's more, the move into bitcoin could have more to do with the state of Goldman than the soundness of bitcoin. The Wall Street powerhouse has struggled lately. Revenue at Goldman's bond-trading division, often its biggest moneymaker, fell 40 percent in the second quarter. That was the worst quarter ever for that division, which has been in an extended slump. And the bank has been looking for other areas in which to make money.

One of those is lending. But while lending may boost Goldman's revenue, it won't improve its profits or return on equity much, not with interest rates near all-time lows and the yield curve flattening. Trading bitcoins, however, could produce high returns. Wall Street trading operations thrive on volatility. And with the VIX, which measure equity market volatility, in the single digits, bitcoin is one of the few areas where prices are still jumping around. So bitcoin it is, at least for Goldman, even if the digital currency is by any reasonable measure in a bubble, and closer to popping than ever.

Bigger picture, the bitcoin divide between JPMorgan and Goldman may have more to do with their histories than a reliable prediction of where the price, or even the use, of bitcoins are headed. JPMorgan, which two decades ago was just called Chase Manhattan, is a giant money center bank that still makes more than half of its revenue from lending money, predominantly dollars. That lending is backed by nearly $1.5 trillion in deposits, again predominantly in dollars.

Goldman, on the other hand, has historically and continues to be a firm driven largely by trading. Despite the recent troubles in that division, the firm still derives more than half of its revenue from trading and less than 10 percent from lending. Goldman has recently paid lip service to the idea that it would like to be more of a lender, and its recent $5 billion revenue growth plan envisions getting 40 percent of it from lending each year. It has launched a consumer lending operation, with millennial-appealing hipness, simply named Marcus. But even if Goldman were to generate $2 billion more from lending, that business would still constitute less than 20 percent of its overall revenue.

In reality, the public pivot to lending is an effort by Goldman, amid swings in its trading business, to show its investors that it's safer than it used to be and to get them to pay more for its stock.

But the embrace of bitcoin indicates that Goldman hasn't quite changed its stripes, and that should worry both Goldman and bitcoin investors alike.

This column does not necessarily reflect the opinion of Bloomberg LP and its owners.

Stephen Gandel is a Bloomberg Gadfly columnist covering equity markets. He was previously a deputy digital editor for Fortune and an economics blogger at Time. He has also covered finance and the housing market.