This seems like a lot of work for one (or two, once it got to China) people repeatedly trying to get into the phone. I wonder if this is like debt collection agencies where the stolen phones get repeatedly fenced at a steadily decreasing value, and each new owner has a go at sending out these unlock copypastes until it's clear that it's only value is in being scrapped.
Doesn't seem like a lot of work to me. Sending out that message takes a few minutes, and I would assume that most people would simply cave in and delete it. It's gone anyways, so they don't really lose much, and being threatened does things to people.
It stood out to me that after the initial text, they followed up two weeks later, and then once per day after that over a few days from different numbers. I would have expected to see someone send out a few threatening messages on one day and then move on to the next stolen phone when it was clear they weren't getting anything.
