It's not. At all.

If someone likes digging tunnels by hand, that's a hobby.

If someone is mad that tunneling companies make it hard for them to find "hand tunneling work", that's not a hobby. That's someone thinking their work is owed attention.

Go find a hobby that you like doing for yourself. Why do you think so many engineers turn to woodworking? It isn't because they think they're going to compete with Ikea.