No idea; it's only anecdotal obviously. But not unheard of; it used to be quite normal in Germany to have small (1-2 person) GMBH's to get rather large contracts for big corps and if you have a 'real company' suddenly no-one expects you to rock up monday morning at 9. In the Netherlands it still works well, as it does in Portugal and Spain; other markets I do not know.
> how many clients did you get in Austria
1 around 17 years ago. But, at least from friends and limited experience, so excuse my personal ignorance, I understand that Austrian business is not very different from eastern germany business and I have (also had) quite a lot of clients there. I have more in the western part, but the eastern part is different in etiquette and I had the same, I guess conservative' feel 17 years ago with the Austrian company (trying to find what they are/were called).
Here it would be impossible as, due to the culture, trust is made only through in person meetings. Nobody will just pay company for services without face-to-face meetings and on-prem presence.
Also, a guy I hire on upwork sometimes made well over a million in the past years via that site, sitting in his house in ukraine. Without a company or anything like that; in modern times it is not so hard as it was.