Thank god we live in a society where the government can't create laws and retroactively apply them to punish people it doesn't like. People and companies deserve to live and operate in a world where the laws are applied as written down and they can trust the government to adhere to those laws.
In fact,
section 11(g) of the Charter of Rights and Freedoms prohibits persecution in this way. Anyone who wants a world where the government can retroactively persecute is advocating for a scary authoritarian world.