Then the mystery is how the CERN "raised" those $1B. Maybe they have an amazing PR department? Or maybe the project is going to be such a huge success that they are acting from the future [1]?
CERN and large construction projects like the FCC employ tens of thousands of physicists and engineers across decades. It's hard to convince someone of something when their livelihood depends on them not believing it.
[1] https://en.wikipedia.org/wiki/Steins;Gate_(TV_series)