You're comparing apples to oranges here. Dataset of levels.fyi heavily skews towards FAANGs and big-tech, not entire SW sector of a nation.
Granted, I was also guilty of that since I was comparing the salary of a tram driver for the local state public transport company where they get great benefits and the union always negotiates top salaries since they have a monopoly and can just increase the bus fare to their customers whenever they need a raise.
But my point still stands. Why bother going to uni to become and engineer in the competitive private sector, if you're gonna net only 500 Euros more than a driver or any other government annex union job?