As much as I will still prefer Donald Trump over Joe Biden even outside of cryptocurrency, I still will not fail to say that politicians aren't to be trusted, it doesn't matter what type of promises they make, or how good we perceive their intentions to be, don't trust politicians because they will never support what they don't stand to benefit from - this is a simple fact.
I can bet you that Donald is only talking good about crypto because he has see the large number of crypto users and supporters in the US, and he is leveraging on that to gain more supporters to himself, this is a simple trick most politicians use, and know how to use well.