As a scientist, I am unambiguously in favor of Sci-Hub and similar sites.
We want and need to disseminate our results as much as possible and the paywalls are getting more and more in our way. You won't find many scientists who are against Sci-Hub - maybe a few at some unusually rich universities of some very rich countries that pay $500 for a color graphics and the $2500-$3000 fee per article for them that makes the publication "open access".
Poorer countries cannot afford the journal subscriptions either, because these can be exorbitantly high - so high, that even top universities have to limit access. I stumble almost daily over a journal to which my institute doesn't have access. Before the advent of Sci-Hub, we often had to ask colleagues abroad on mailing lists for (technically illegal!) copies of articles to be able to conduct our research.
I might add the actual legal way at our university in case anyone wonders. The official way to get paywalled papers we do not have bulk-orders for is this:
1. Go to the university library in person.
2. Submit a order-and-copy request for that paper.
3. Return 2 days later unless there is a weekend in-between.
4. Print a non-searchable, non-zoomable (extremely annoying in CG where I work) copy because getting the PDF is forbidden due to legal issues.
Now combine this with the usual way to do related work research for your own paper:
1. Search relevant papers for your topic.
2. Check who else cited these paper and read those papers.
3. Complete this breadth-first-search until time runs out or the papers become too off-topic.
This (in my field) yields a stack of around 120 papers I would have to order that 2-day-print-copy for of which in turn 100 are most probably irrelevant and hence will not be part of my papers related work section. Note also that I would have to order each "layer" of the breadth-first search separately - each time taking 2 days. Compare that to a day of related work research with sci-hub.
Quite obviously I have never met a researcher who took the legal/official road ;)
We want and need to disseminate our results as much as possible and the paywalls are getting more and more in our way. You won't find many scientists who are against Sci-Hub - maybe a few at some unusually rich universities of some very rich countries that pay $500 for a color graphics and the $2500-$3000 fee per article for them that makes the publication "open access".
Poorer countries cannot afford the journal subscriptions either, because these can be exorbitantly high - so high, that even top universities have to limit access. I stumble almost daily over a journal to which my institute doesn't have access. Before the advent of Sci-Hub, we often had to ask colleagues abroad on mailing lists for (technically illegal!) copies of articles to be able to conduct our research.