Sincerely speaking those beneficiaries of this electric power supply would be curious to know more about this Bitcoin mining and it's network, and before you'll know it more persons would want to adopt Bitcoin. That is why is why giveaways and promo are one of the best strategy of advertising. The miner might not be advertising Bitcoin, but his deed has already done the advertisement unknown to him.
You should also know that those in the rural areas will not want to go deeply into bitcoin because of their lack of access to the internet, while some a more not educated to be able to use the internet which is required to know about if you want to delve into bitcoin. To search for the knowledge of bitcoin might not benefit them at all, but the selfless service that the miner is given to them will be appreciated and bitcoin will be recognized to be the sole aim of the service. Humanity should always come first and this is what the miners are doing for the village in which they are having their mining operations on.
Indeed we know that Bitcoin is a decentralized currency, meaning it is not controlled by a central authority. However, no one is being paid to advertise Bitcoin to increase its adoption, but the good news from the coin and the testimonies it's holders have is enough for other to trace and want to know about it. And often times the people who fight or give false info about the coin are indirectly advertising it to the public. Take for instance the media, it was after they placed a ban on crypto in Nigeria, that was when I became curious to know what it entails but I never got the chance to complete my research until I met this forum.
Advertising about bitcoin now is not something that any bitcoin enthusiasts is bothered about. Bitcoin has already passed that stage on it needing to be advertised for the public to know about. It has achieved the penetration that is required to be well known all over the world. So, both good and bad news about bitcoin will just be base on individual opinions on how they feel about bitcoin and not a general opinion. Those that have embraced it will not be discouraged no matter how many times a bad news is published about it and those that don’t like it will always leverage on such news as their weapon to why they won’t embrace it. Bitcoin has passed the test and so it doesn’t need any advertisement to continue thriving.