> The agricultural machine manufacturer has a subscription service that lets owners repair their own equipment. Why is barely anybody using it?

Because it doesn't address the actual problem.

Requiring a subscription violates the right to repair. Even for backwater places where the right to repair isn't enshrined in law (like the usa), people still know what the right to repair is, and often refuse to use a paid service what what ought to have been included in the base price.

Why would you pay extra for some website the company could just take away from you on a whim? I have the bound paper repair manuals for my 1998 Dodge truck, my 1995 Toyota, and my 2002 Kubota tractor. Nobody can arbitrarily take those away. Why can't companies these days just print a shop manual and be done with it?