Any tool/service private and strong enough to protect political dissidents, opposition journalists and all the 'right kind of people' will inevitably be used by

Any tool/service private and strong enough to protect political dissidents, opposition journalists and all the 'right kind of people' will inevitably be used by criminals as well. If they can choose to reveal information about one group they can be forced to reveal information about anyone. The only real way around that is to make it private, invite only, and vetted and only invite people with a large enough public presence to be able to have a chance at figuring out if they're the 'right kind of person' which means it can't be open to the average person.