The plasma industry has huge 10 billion dollar companies like Grifols. The red blood cell industry is mostly dominated by the Red Cross in most places, but also includes smaller non profits and some for-profit companies. The margins for red blood cells sold to hospitals are really thin (they charge ~$200 per unit, depending on a lot of factors), and I don’t think those companies are as sketchy and profit driven as the plasma industry.
I would still recommend donating blood. Hospitals really need that stuff, and it gets expensive when it hard to find donors.