"Robotech spammers are also targeting group messages by using automated programs to send thousands, even millions of group texts to random phone numbers with the hopes that somebody will take the prey and respond."
Also, some users give random apps access to their address book for whatever reason then there is a whole list of known good emails and numbers to spam.
https://calleridreputation.com/blog/robotexts-are-replacing-...
"Robotech spammers are also targeting group messages by using automated programs to send thousands, even millions of group texts to random phone numbers with the hopes that somebody will take the prey and respond."
Also, some users give random apps access to their address book for whatever reason then there is a whole list of known good emails and numbers to spam.