I actually do know quite a few people who look up the imprint before shopping there, especially when they buy stuff as a business. You’re obviously right but it’s fairly easy to copy an imprint, and the whole shady lawyer thing for minor errors also is absolutely a pain.
I don’t think it’s completely useless, but it’s certainly not perfect either. As the parent comment suggested having a business register It’s legit domains would probably makes sense from a consumer protection point of view.
However, with the current state of the digital administration in Germany this change would introduce so much overhead that it would lead to a lot of justified opposition.