Facebook and others have been scanning your private messages for many years already. Then someone discovered that this practice is illegal in Europe. So they passed the temporary chat control 1.0 emergency law to make it legal. The plan was to draft a chat control 2.0 law that would then be the long-term solution. But negotiations took too long and the temporary law will expire on the 4th of April (not the 6th) which means that it will be illegal again for Facebook and others to scan the private messages of European citizens without prior suspicion of any wrongdoing.

Chat Control 1 says, eh do it anyway if you want on a voluntary and temporary basis until the Courts get around to saying no.

Chat Control 2 says you have to. Until the courts finally get around to striking it down in 15 years.