In reply to Jose conti.

I truly feel bad for you having to see those terrible things, and am grateful for your efforts over the years in supporting the plugin. But I have to say, you did not have to sit and watch videos or look at pictures? I have come across some unpleasant sites in my time, and people often share nasty videos I do not want to watch, but once I realize what it is, I close it quickly, I do not sit and watch it.
I hope you reported these sites to the police when you found them? If not then I would echo what others have suggested, and maybe work together with an appropriate legal entity who track down the owners of these sites and put them in prison.

I would also say this is another good reason to charge for the plugin, maybe you do not want to make money out of it, but you could then train and pay for other people to work on it instead. All you need to do is cover costs, nobody would begrudge you making a living from it.