I have gotten three kinds of those:
1. Someone texting the previous owner of my number (John). I got all kinds of traffic for him, including debt collectors, friends, ex-girlfriends, employers, etc. I gather John ran into a spot of financial trouble, dropped his phone-number, and skipped town.
2. An old high-school classmate trying to find my mom found my number on one of those people search sites, probably associated with her address.
3. A random girl who just wanted to chat. I talked to her for a few messages, but didn't progress to a romance scam. She seemed real to me, but who knows?
3. Ummm... hate to break it to you, but that's the start of the scam. Hope you don't fall deeper into that convo!
3. is a romance scam. pig butchering/romance scams take place over multiple months, not one texting session