You have really made me think!
I still think you are being sophisticatedly sarcastic or something and I am just too obtuse to grok it.
People often get badly injured doing the thing they love, at oration even; but you can learn to ameliorate the deleterious effects through proper technique and practice. You don’t need to develop nodules on your vocal chords from speaking too loudly, too often and in the wrong way.
RSI, (which I’m assuming you are referring to) can also be combated in this way. Perhaps your motivation is informed by some specific knowledge of a more repressive regime of effort which must be employed to drive a typewriter. Or maybe there are other factors at play and again, there goes that obtuseness.
The love and effort which the people making the zine must have for their product would seem like the jumping off point. Immediately going to ‘but it might be bad for them’ might really be the country next door to ‘concern troll’ and I’m prepared to believe it, in your case (the whole point of my comment was that I respect you as a commenter and was weirded-out by my reading of the situation).
But I’m sticking to my guns. And my obtuse gunpowder.
*Shrug 
edit: extra word
