>>pyeri+8c
It's because they are ultimately beholden to "shareholders" and "shareholders" nowadays expect continual growth. Not maintaining the "growth" will cause the share price to plummet and will eventually get the CEO fired. Furthermore, the high interest rates we have now are squeezing the hell out of margins, requiring these CEOs to look for turnips from which they can squeeze some blood.
So tldr, the greed is a result of systemic forces, corporate structure, interest rates/inflation, and numbers on a spreadsheet.