Those attemps are surging pretty much worldwide and come from authoritarian groups. In Europe, people with at least a bit of common sense have been fending it off, but there’s always a new proposal around the corner with some form of bait trying to lure people into giving away their rights becase of some perilous danger they should be ashamed to neglect solving. I wouldn’t worry about Linux backdooring for now. There’s nothing wrong with creating a custom distro suited to an organization’s needs as long as it’s kept well maintained and updated if that’s what worries anyone. All vulnerabilities and exploits on Linux are always found and solved at record speeds.