I've heard this type of comment a lot but in my experience there isn't any shortage of tech companies in the EU.
What EU regulations hamper isn't job creation, it's employee and customer exploitation. The distinction between "job creation" and "employee exploitation" is important.
What the former means in practice is that there is a massive contractor market in the UK and EU. So if companies need temporary staff, they'll hire a contractor. If they need permanent staff then they'll hire an employee. And contractors in the UK & EU are paid significantly more than their employee peers. In fact their pay is much more equivalent to US employees. So companies will make constant tradeoffs between more expensive labor for short-lived projects vs cheaper staff and knowledge retention but stricter employment laws. It's a fair trade most of the time.
So a more accurate way of comparing US vs EU businesses in terms of employees would be US employees vs EU contractors. Things then begin to look a lot more equivalent.