system
A chat on subreddit /r/wallstreetbets
human
You're required to report all of your transactions to the IRS and any place you can buy stock from will also keep track on you buying it and send a copy to the IRS.  At the end of the year you'll get a Form 1099-B from them with all your information on it. 
  
 Very similar to how the IRS will know how much income you had.

gpt
Yea but there's ways around it. Let's say your shitty uber stock is down 8%, you decide to sell and rebuy into a similar shitty stock like Lyft - that is not considered a wash sale