Just a point, the Biden investigation held off because he was not a federal official at the time he took the bag, so not a federal crime, until he started doling out favors or quid pro quos once taking a federal office.
It could have been some form of state-law bribery, but it's unclear whether he delivered any kind of non-federal quid pro quo after taking the bag. In that sense it's a lot like the Hunter Biden thing: did Hunter try to present the appearance of influence in the Biden Administration for fun and profit? Fuck yeah he did, just like Jared, Donny, and Eric. Did he ever actually exert influence over the Biden Administration in return for the various favors he took? Fuck no he didn't because Joe wouldn't touch him with a 10-foot pole that way.
Of course, Trumpco didn't care whether he delivered or not and just dismissed the whole thing, pretending it's not shady.