Earlier quoted context omitted.
Been on both sides of that end, the problem is that especially outside of the US offering paid services comes with some serious challenges on its own: - registering a business entity costs money and (especially in dysfunctional bureaucratic hellholes) time - you can be held completely liable for whatever you offer if you don't take excruciating care with the legalese fineprint - it's a complete nightmare on tax filin…
You don’t need to register a business for a bit of side money. Even in Germany, you don’t need to register as “eingetragener Kaufmann” unless it’s, you know, actually a proper side business and ticks some criteria. Going down that road, there’s heaps of people doing consulting as sole proprietor (or e.K. In Germany) without getting sued or stuck in tax hell I think you’re looking at things a bit too pessimistic here
You absolutely can do a Gewerbeanmeldung. The problem is, without a Kapitalgesellschaft ("Mini GmbH" and similar), you're fucked liability-wise. Your entire private assets can be taken if you end up bankrupt.