While I was tempted to say that the Tyson/Jake Paul fight was scripted, I changed my mind when I heard Tyson say the following at the end of the match:
"Had 8 blood transfusions. Lost half my blood and 25 lbs in hospital and had to fight to get healthy to fight so I won."
Even if he exaggerated a bit, this is likely the real reason why he was half the speed he was 9 months ago, before he got sick. And as for him not trying to throw punches in the last few rounds, simple: He missed Jake a few times and probably realized he wasn't fast enough. So, he got real defensive.
And I don't buy the idea that it was scripted for the simple fact that it was a sanctioned fight. Hence, illegal to fix it. Hence, even if Tyson had signed an NDA and spilled the beans later, he wouldn't lose a dime as the NDA would be unenforceable. There would be way too much to loose for the promoters and Jake Paul if something like that came out.
People say its fix cause we all wanted to see Rocky Balboa 6 come to life. But life isn't a movie, even if we sometime see it unfold, live, on TV.