Earlier quoted context omitted.
While you may not take this as proof it affected this exact decision, it's hard to ignore it as a possible reason. https://www.cnbc.com/2020/02/10/amazon-wants-to-depose-presi...
Bezos wants to help elect someone who (his lawyers allege) killed a gov contract favourable to his own business? Or did I misread your comment.
It’s pretty simple here: he didn’t endorse Trump. But he doesn’t want to get on his bad side in the case he is elected.
Make sure you take a moment to comb your moral fabric and see if that jibes with how you think the world should work.