For basic residential plumbing work the moat is not knowledge. There are already books and YouTube videos that will teach you everything you need to know. Professional plumbers can't stop that. The real moat is that most people don't have time, don't want to buy tools, and don't want to get shit on their hands.
For new construction and commercial work the moat is a contractor's license. They don't allow LLMs to take the licensing exam yet.
"Professional plumbers can't stop that. The real moat is that most people don't have time, don't want to buy tools, and don't want to get shit on their hands."
"don't want to buy tools, and don't want to get shit on their hands"
Thats closer to the truth. The rest of your post is fluff. Its pure economics, not rocket science.
Yep. I can do basic plumbing, but I haven't touched it since I started making enough money to pay a plumber to do it for me. Plumbers are worth every dollar they charge if it means I don't have to spend two hours under a sink cursing at rusty bolts.