My experience with maintaining open source projects (though mine are very much smaller) is that it's quite similar to a business: you just have to deal with stakeholders and people who think they are stakeholders.

I had all the same experience at work:

• Some unknown person from an unrelated team contacted me because something that my team does not manage broke. I tried to help a few times and I suddenly became their personal IT support team.

• Another time someone not even working at my company demanded that I drop everything and fix their problem, because my name appeared in 3rd parties libraries.

It's sad that open source authors don't always receive the recognition that they deserve.