I wonder if giving the information to the coporations competitor (as anonymously as possible of course) would do anything good? Try to turn the corps against eachother. At least you would know if they are secretly in league if the competitor doesnt expose them.

Also, i think anyone who is in position to do something like this should try to find more like minded people and continue as a group. Even then its dangerous but much less so than alone since there are more people to help. You wouldnt resist enemy occupation alone and expect to live long either.