If I were a business, the answer is no, the regulations are very strict.

But I am not a business, I'm a hobbyist. I derive no income from my channel.

By my estimation you would need at least five employees in Germany to run an online business properly, as the law that governs businesses is voluminous and bureaucratic. I could not afford to run a business.

For example, if I were a business in Germany, other YouTubers could sue me simply because I didn't follow packaging or E-waste laws in one of my videos. And that is to say nothing of surprise laws that you couldn't even predict would be laws.

Also, under German law I'd need permission from my existing employer to run a business, which they would not likely give.