From: "Jorge Stolfi" Date: Fri, June 12, 2020 6:42 pm To: pr@brilliant.org Dear Brilliant, I noticed that your project, otherwise fantastic, has included courses on cryptocurrencies. Please take them down. As a technology, cryptocurrencies are a failed attempt to solve to a problem that had no practical interest. Its flaws were not noticed at first, but they became obvious more than eight years ago. Simply put, they are utterly inadequate as either alternative forms of money or as systems for legal payments. Cryptocurrencies are still alive today for two reasons only: (1) They are a convenient money laundering tool for all sort of illegal activities, including traffic of drug, sex slaves, child porn (and child sex slaves), ransomware, tax evasion, bypassing sanctions, and all sorts of scams. (2) They are one of the largest financial scams in history, that already transferred some 15 billion USD from naive "investors" to the organizers (the so-called "miners"); money that will never return to the former, in any guise. In (2), like in any pyramid investment scheme, the profit of investors and organizers depends entirely on convincing more people to invest in the scheme. Thus bitcoin pushers are always trying to insert their misleading marketing into all sort of contexts, especially in those that could give the concept an aura of respectable technology and/or investment. That, unfortunately, is what seems to have happened in your organization. Sincerely, --jorge -- Jorge Stolfi Full Professor/Professor Titular Instituto de Computação/Institute of Computing UNICAMP