Scammers are good at the scam. They are good at telling the right lies, they often work in teams (lead finders, closers, and everything in between), use automation where appropriate, etc.
A single dev might have trouble cracking the lead finding code, the resume code, the interview code, etc while and avoiding telling any lies that will get then fired 3 weeks into the job. But a team who all treat the application process as a full time job? It's a lot easier.
Also when a dev gets good at finding a job, they stop looking. Scammers get good at it and then keep getting better.
My resume is shiny enough and I've gotton hired enough times im a good candidate for this kind of scam.
This feels like a very ham fisted approach for them though. 99% of engineers are going to ignore or not take seriously these kinds of out of the blue offers.
Their resume goes in front of yours in line.