Do not put your money into Pix because Brazil's government has become extremely authoritarian and anti democratic, including jailing political opponents.
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.
I meant to say "you don't" here.
You do not "put your money into Pix", your money is in your bank account. Pix is just a bank transfer mechanism; if you have a Brazilian bank account, you can send and receive through Pix.