I understand your struggles, but the way the "system" is set up in Spain, this isn't going to change soon. In most small municipalities the people in charge have no idea what are they doing, and most of them don't get any money for it, so it's just the local guy who likes to be known or has some personal interests, and maybe, sometimes, someone that does it for the altruism.

Maybe I would say that for ISPs there are plenty in rural Spain happy to lay fiber if you can assure them enough recurring revenue.

Even with the not so small ones like Adamo you have a chance of getting fiber laid.