[onion2k]

True... but cost of living is considerably lower.

While companies continue to base offers they make on your current salary (if you're silly enough to disclose it), accepting a lower salary on the basis of a lower cost of living is going to lower all your future salaries.

While in the US, I see seed rounds of 0.5-1.5 Millions, the last 2 seed deals I've seen in Lisbon were of mere 50K€

Seed rounds don't exist in the US any more. The first raise is effectively a Series A, because startups are expected to bootstrap to revenue now.