It’s not that bad as I understand it. If you are using arch with a Pascal GPU you can switch to the legacy proprietary branch. https://archlinux.org/news/nvidia-590-driver-drops-pascal-support-main-packages-switch-to-open-kernel-modules/

They can’t, but that is not the purpose. If the chat control passes then all big services will be forced to leave EU or build in a backdoor. That will give them control over more than 90 % of the population and satisfies their goal. You and your friends are a rounding error. And if you would perform a crime, or are suspected of one, they can use the fact that you encrypt your messages against you.