As far as I'm aware, Pix is just a way to transfer money. You do "put money" into Pix.

Regarding the rest, I'm not following Brazilian politics that closely, but if politicians try to stop a democratic transition of power, then any functional democracy has to deal with them. I don't know how you can do that without doing things like jailing those who were involved. We can't do whatever we want and then call it political prosecution.