Professional thieves either chop the bikes up or collect them and export.
It would be nice to have some kind of international theft settlements/sanctions for those countries that receive stolen goods or allow internet scams. That would at least align incentives somewhat for those in power, but it is still very difficult to sanction enough that it outweighs the bribes from the criminal revenue stream.
It's a difficult situation.
https://bikeindex.org/news/closing-the-loop-a-deep-dive-on-a...