A man who worked at the meat department in a large grocery store was telling how things were done. The "fresh" meat like steaks and roasts was on sale for a day or two. Unsold meat was ground and offered for sale for a few days. After that, it was used to make sausage.
I've often bought ground beef that was bright red on the outside but more of a brown color inside. They put the freshly ground scraps on the outside with some chemical to keep it red longer. They also grind ice with the meat to increase the weight.
I'm old enough to remember when they didn't pre-package meat. You went to the meat counter, selected the cuts and they wrapped them in white paper. The ground beef wasn't dripping red fluid like the packaged ground beef today.
Since I started buying from the meat market, I've noticed that there is more ground beef after cooking a pound of 80% lean ground beef from the meat market than from the grocery store and no fat to drain.