One interesting thing about sci-hub is that it's actually in a researcher's best interests to have their articles uploaded to sci-hub and widely distributed. The more people that have access to an article, the more people can build off the ideas contained within, resulting in potentially more citations and advances that the original author can take advantage of.

So, you reading articles off of scihub and expanding on the contained work within directly benefits the author. Just make sure to cite the author if you yourself publish! (Which is actually much less difficult than you might think. Even a blog post can contribute to the field).