Again…. All this raises the question of why try to move a mountain to force a company to sell you parts? Why try to compel them to do something they don’t want to?
A couple of examples that I've personally experienced with my Scubapro S600/MK25 sets:
1. I bought the regulators with a written lifetime warranty and free service parts. Scubapro decided to change their policy and just ignore those of us who bought a product that included the warranty. It's a pretty clear violation of magnisun-moss I would think.
2. Since the free parts was voided by scubapro, I tried to
buy a service kit that should have been free and DIY. I was not able to do that in the US, several shops quoted a scubapro policy that only authorized service centers can buy scubapro parts and they supposedly not allowed to resell them to me. I had to order them from outside the country.
3. Since I did the service myself, and made the mistake of mentioning it while in a shop when dropping off a bunch of stuff post-covid to make sure all my gear that had sat for over a year was good to go... the shop told me my warranty was completely void. Also a explicitly prohibited in magnisun-moss.
If you search back on old posts from me, you'll find some when I first got certified and was deciding what brand regulators to get. The free parts and lifetime warranty was the main reason I purchased Scubapro regulators in the first place. It's also good gear, but if that had not been a factor I may have decided to buy a different brand. Deep6 would be a good choice today, but they didn't exist at the time. I think I was considering Aqua-Lung, Poseidon, and Scubapro at the time.
While Scubapro is probably the most egregious violator of magnisun-moss in scuba, I'm sure there are other companies refusing to sell parts to end users or voiding warranties for properly performed diy service or service performed by a non "authorized" technician.
I've filed an complaint about my problem with the FTC since I don't have the cash to lawyer up and defend my rights on the issue. Perhaps if others do the same, the FTC will do the lawyering up in our stead.