Here are the rules for registered investment advisors.[1]
This was a pump and dump. Those have been around since at least the 19th century. Older ones involved newspapers and newsletters. Newer ones involve social media. The SEC fines people for this regularly. This time, the suckers were people who hadn't seen this a few dozen times yet.
[1] https://www.sec.gov/divisions/investment/iaregulation/memoia...