Thank you all so much for your support. I appreciate it very much, and it helps me to look for the strength I need to continue working.
I prefer to be able to visualize this type of problems, instead of knowing they are happening in places where i cannot access. If there is something positive in this case, I think it is the fact that the community can become really aware of how difficult and fragile is the development of professional software in such a small and complex market. For these reasons I have preferred not to take action to have this video deleted, at least not for now.
On the other hand, it does not make sense for us to take legal action against this 'genious', since the Spanish and European legislations are basically useless to protect us, and we lack the necessary means to maintain a litigation of these characteristics, which in the end would leave him laughing and us just with less time and money.
The fact that this is happening publicly in YouTube is really impressive in my opinion. This guy has no problem at all stealing us publicly, advertising himself, and even asking for a donation for his 'work'. I have managed to identify him relatively easily. I know his name, his Facebook and SoundCloud accounts, and even where he lives. Some people that have commented publicly on the video are participating with their real names, and I have identified them as trial license users. Along with the obvious fact that this guy is not a professional hacker (either he has a serious issue with his ego, or somebody of a higher level has helped him), this demonstrates that software piracy is being considered as something perfectly normal, and even valuable, within a—hopefully marginal—subset of the astrophotography community. What I ask is that these people and attitudes be cornered as they deserve. Not really to help PixInsight, but to protect astrophotography and its future development.