I think the machine is keyed for the Belkin size screen protector. They are not all cut 100% the same.
And I agree, I've bought off brand ones on Amazon and never had a problem. Sure they may only stick properly without lifting for a few months (the quality may not be top notch), but you can easily find a 2 pack for $8. Even if you change it every 3 months for a year you're out under $20 still.
I have used the spigen ones for years. Only had to replace once a year when cracked. But I can see the size difference with the machine only working for Belkin. Makes sense
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