Yes, it’s possible that they’ll change in the future but that doesn’t make it inevitable. Everything you describe could have happened at any point in the last decade or two but didn’t, which suggests that it’s not “waiting for the right MBA” but an active effort to keep the abusive ones out.
One thing to remember is that they understand the value of long-term investments. They aren’t going to beat Google and Facebook at advertising and have invested billions in a different model those companies can’t easily adopt, and I’m sure someone has done the math on how expensive it would be to switch.
Make no mistake, they're just waiting for the right MBA to walk through the door, see the sky high value of their users and start chop shopping that.
Enshitiffication is always available to the next CEO, and this is just going to be more and more tempting as the value of the walled garden increases.