

@stux I'd be careful with "perfectly useable". Those bikes are manufactured quite cheaply and the fact that you can drop most of them just anywhere doesn't help keeping them in a working state.
But yeah, some of those graveyard were created after the initial business model of those companies was ended: My guess back then when this stuff popped up initially a few years ago was to leverage the deposits users have to make on subscription to service for other investments: a few 100 RMB deposit times tens of millions of users amounts to billions of RMB.
This business model was scrapped rather quickly however, when complaints about not getting deposit refunds where raised and authorities force the companies to have the deposits on some special bank account type and thats roughly the time when the backrupies started.