Unrelated to this thread, but I always found 'optiver' such a weird name for a Dutch company. Sounds to me like "optiefer". "Optiefen" is a Dutch way of saying "fuck off".
Optiver works in a vastly different and super tiny sector (in employee count) which is renowned for having higher salaries than any other sector (including tech) and is a massive outlier.
Yes, though there's also a couple other examples. In my experience the biggest barrier to europeans getting fairly compensated is just that people believe it's impossible and so don't seek out the industries that do.