The first is a vampire looking to take what was publicly or even privately owned, extract every last dollar and leave the shell with the debt of buying the next victim.
Private Ownership is Valve or Porkbun - The people running the business want to make a profit but not to their own or their customers determent.
I mean not always, but that does happen and that's what you hear about.
People mean "acquired by a Private Equity firm". You can learn what one of those is here: https://en.wikipedia.org/wiki/Private_equity_firm