The "Justice" Department selectively prosecutes, as tons of historical evidence shows, as most recently shown with the J6 defendants getting the book thrown at them and that TV show guy's staff getting a pass. This is baseline from there we have to draw some conclusions based on some new data.
There are all sorts of new leaks that the "FBI is at a critical juncture in the investigation" of Hunter Biden and other such trial balloons being floated about. They are making it out like they are going to do something. Of course, they had the laptop for years and did nothing, so this is highly suspect to say the least. And further, they know if the GOP takes the House or Senate it will be investigated by them anyway.
If he's charged, and it leads to an eventual trial or guilty plea, it will be used as the pressure to push Biden out of office. The guy has covid they said, and just said on national TV he has cancer.
At a minimum, they get out ahead of the GOP investigations, making them seem proactive, and further, it keeps them from having to share information with Congress due to it "being part of an ongoing investigation". Coward GOPers don't fuck with intelligence agencies, they have 7 ways from Sunday to get back at you.
It will depend on who stands to lose what. It's not all about him, but rather a network or connected interests.