> Can you name many EU startups that IPOd or got acquired for an impressive amount during the last decade or were even considered "unicorns" at any point by anyone other than themselves ?

In Addition to what sobani said:

HelloFresh, Transferwise, N26, Revolut, Telegram (if you stretch the meaning of Europe), Klarna, Auto1 Group to name a few

Of course not all of them operate globally but that isn't a requirement