1. The difference between ‘abandoned’ and ‘maintained’ is that ‘maintained’ is bounded at the lower end to a greater-than-zero amount of maintenance work. Not a specific amount but necessarily >0. (Without that, “maintained” and “abandoned” become the same thing and that’s absurd).
2. “I am the maintainer” can be a voluntary statement, it’s not compelled (e.g. by a gun to the head).
3. The role of ‘maintainer’ is ‘doing that >0 amount of maintenance work’.
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By the time we’re arguing how much maintenance, you’re agreeing with my position. In the case of your garden, if I saw it on fire I would think it reasonable to contact you about the fire given you are the gardener. I wouldn’t contact someone who was not the gardener.