Donald Trump won't let go of 2020, specifically, his election loss to Joe Biden.
A normal person would've just accepted what happened, and moved on. Because of how he was mentored by his late father, Fred, and the late attorney, Roy Cohn, Trump is incapable of this. Instead, it eats at him, even though he's back in the White House. He just doesn't know how to put it behind him.
Consider, then, a recent raid in Fulton County, Georgia, supervised by the head of the office of national incompetence, Tulsi Gabbard. Five-plus years later, Trump still wants proof that doesn't exist that he was somehow screwed in 2020. You can't make him understand that the more he complains publicly about it, the worse it's going to be for him in the public eye.
As Farron Cousins explains, the chances of any vindictive prosecution coming out of this are just like the proof he seeks. Mythical.
Which is why this falls under, "why are they even bothering?". Because they're too stupid to realize that Puerto Rico-born Bad Bunny is an American citizen. It's been nearly 20 years since Kid Rock's last hit record, and then, he'd sampled classic Lynrd Skynrd.