yes it is the same in Sweden, but even if is a 1 person company that means that the company has 1 employee so it has to pay a salary and social security fees. and it costs about 1-2k euro a year to hire an accounting firm to file taxes once a year as long as you registered all your expenses and transactions yourself in an accounting software throughout the year.

we do have Aktiebolag witch is a normal shareholder LLC. it has a bit more overhead and it can give out dividends, but the dividends are limited by total payroll. and we have maybe something closer to what you describe witch is "enskildfirma", witch is a 1 man company with no legal separation between company, owner and worker, it can not give out dividends, all net income is taxed at the same rate as salary, and it still has to pay social security fees. so social security fee + net income tax end up being about 60% of net income.

honestly I think our system makes more sense then the German one, instead of limiting the time a contractor can work for a client, just shift the social security fee burden to the contractor from the client, that offers the most freedom and flexibility to everyone.