system
A chat on subreddit /r/wallstreetbets
human
Dude, every like company that sends texts automaticly uses them. 
  
 You can test if they use them by responding with STOP. 
  
 I've programmed some chat/sms servers before, twilio is an amazing company I see a bright future of 'harassment for money' in them.

gpt
Political text ads are the worst. The fuckers keep recruiting more people which means different phone numbers to text people.