As you say, Apple can be pretty unequivocally considered a success story. To the extent that it was ever troubled at all in the first place, Microsoft is also widely considered to have turned around its fortunes. Dell seems to be another turnaround story.

Then there are companies that have at least managed to stabilize themselves reasonably, e.g. IBM and HP (I wouldn't consider either of them a huge turnaround success, but I would not expect them to head for bankruptcy anytime soon either).

And even companies that did go under, e.g. Kodak, took an enormous amount of time and effort to do so, and not without launching a cryptocurrency first…