Without their permission you're right, but if they sought permission from those accused they might well agree to it, in which case it would no longer be immoral - no idea about legal status, if both the prosecutors and prosecuted want to do it.

Why they would agree to it - if convicted they lose that money anyway, if found not guilty, by paying for the servers now they will still have all their data if they decide to get the site back online and resume business as normal.