Worked with many Polish developers for the last 8 years. Great group, very talented. However, the initial motivations to go there were to keep costs low. Eventually they saw their salaries increase 3x or 4x over the years. They totally deserved it, but the economics change if you're running a startup. Now with AI, not clear if the tech outsourcing dynamic will remain.
Anecdotal, but the company I work for offers to the juniors only +15% to what it used to offer 15 years ago. The salaries are growing mostly because previous government introduced huge increases to minimal salaries, but I don't feel the wages in IT grew significantly over the years. Which actually make sense - we used to have huge disproportion between regular worker salaries and IT ones, now the difference is getting smaller.