High US salaries come from US VCs having to bid against other to capture talent. US VCs have more capital than EU VCs. This is why.

The EU is now going to start pumping money in to building European alternatives. EU software dev salaries are going to increase. All 27 states agreed to establish the saving and investments union.

Nothing will happen overnight but you'll see this start to play out over the next 5 years. It will take decades to catch up but we are starting.