One of the responses to that tweet stated that they are allowed to share their earnings to reporters early with a non-disclosure agreement[0]
[0] https://twitter.com/campuscodi/status/1186768962362568704
[0] https://twitter.com/campuscodi/status/1186768962362568704
https://www.theverge.com/2018/8/22/17716622/sec-business-wir...
2. It is the day of earnings and typically there is more volume than usual that day, especially in the last hour.
3. Lots of people make (and lose) money the day of earnings. Are you going to arrest everyone who made the right large bet on a stock before earnings? If so that prison is going to very full