The real problems startups face in the EU are labor and tax laws. Companies can't use equity as compensation (which is a big lure for talent) and it's extremely hard to fire people (which makes pivoting or dealing with general market changes impossible for small companies). Pro-employee policies are necessarily anti-employer. Smaller, more innovative, companies have a harder time surviving such policies. So long as there is greater risk in EU companies, investors will take their money elsewhere.