The internet is global. A person sitting in Palo Alto, a shack in a rural village in Southeast Asia, etc. doesn't care about German law and is, in all but a few exceptional cases, beyond its reach in the real world.
Let's say some company or "entrepreneur" sitting in an office in Palo Alto or in his house in the Philippines wants to sell a SaaS app they vibe coded in a week.
They use AI to create a marketing email and list of targets. They blast it out and it lands in the inbox of some dude in Germany.
Do you really think the company or individual is going to ever face any consequences for sending the guy an email?
The bottom line is that in the real world, some random "entrepreneur" or SME sending an unsolicited "Hey software guy, I have a service you might be interested in" email to somebody in Germany isn't ever going to cause them trouble.
But that also doesn't really matter to this discussion - the law existing provides evidence that not wanting to receive unsolicited corporate communication is not a fringe opinion.