Fun anecdote from the article about a previous merger one of these companies did:

Washington seeks to avoid the situation it found itself in a decade ago, when Albertsons bought the Safeway chain. To satisfy regulators concerned about that deal's potential impact on supermarket competition and consumers, Albertsons sold 146 stores to Haggen, a small grocery chain based in Bellingham, Washington.

But Haggen struggled with the expansion. Within six months, it had closed 127 stores — including 14 in Washington — and laid off thousands of workers. Haggen sold its remaining stores to Albertsons in 2016. Now, 10 Haggen stores in Washington are on the list to be sold if the merger happens.

Look at the math on that little offer they did to make the merger more palatable. lmao