This guy tried to resolve a legal dispute without a lawyer. Any competent business lawyer should have been able to straighten this out within days. He even tried to do process service himself, which nobody does. You pay a process server $100 or so for that.
No, the guy tried to resolve the legal dispute with lawyers and has been quoted multiple hundreds of thousands of dollars in fees.
The guy who tried to serve the papers isn't the owner of the legos. It was a YouTuber who got involved and has been making video content on the subject.
If I'm reading this right, he travelled to a different state to serve the paperwork to the guy in person. He would have had to spend a lot more than $100 to do that.
He also didn't leave after the police were called, which is not all that unusual for someone who looks out their window and sees someone they're in conflict with has traveled across the country to stand in front of their door.
This is just needless YouTube drama generation. I agree, he should have paid a process server to do the job correctly, but that wouldn't be good business for his YouTube channel.