I'd like to answer your challenge that you put forward in your article. I can think of two straightforward uses for cryptos.

1. It helps evade financial censorship imposed on legal businesses and individuals. Ex: 4chan is financially censored, and can only take bitcoin and other Cryptos as payment despite having broken no law.

2. Financial Privacy (in say, monero). Ex: Support controversial causes without having to worry about losing your job in case of a leak.