I think the manufacturers should have protected territories for selling games, just like the good old days.
I remember how that prick Hank Heiser of Empire/Bally Midwest actually had his parts counter guys call the front office when requesting parts for certain newer games to verify if he sold the machine to the buyer of any parts. When there would be a mismatch, he would toddle out and yell at us, the low-level flunky technicians, that he is not selling us a part for a machine we bought from someone else. Mr. Big Man.. LOL So, as I relayed that info to one of my company's owners, a call was made to Williams (Martin & Snyder had just gone out of business so Bally Midwest was now the Williams distributor). Within an hour I was paged on my two-way to go back and pick up the part. I recall it was a weird flipper base or coil stop for a Time Warp but it may have been something else.
I popped in to Mr. Nutty's office and said "Thanks for selling me the part after all". If looks could kill, I would have been dead.
He was a popmous ass because his daughter studied acting and supposedly dated Bruce Springsteen. Up until then, she had a few roles in some B movies. Eventually, she had a role in LA Law with the character name Allison Gottlieb. I imagine the Gottlieb name was related to pinball but who knows and who cares.
The protected territories were for machine sales, not service parts. It helped that one of my company owners was a Lawyer. He made the call to Williams.