The NY magazine is very interesting, thanks for posting the link.
The bike messengers remind me of Washington DC in the 1980s.
The politically incorrect term -- I gather from the Wikipedia entry -- is what I knew them as: tiffin wallahs. A hugely complex, very large-scale, multi-modal transportation out and back operations, from thousands of individual homes to thousands of offices and back again, dailly, with each operator collecting dozens each of the tiffin boxes delivering them practically error free despite the operators' generall illiteracy. The first and last mile -- at least -- were by bicycle. Apparently you don't need to be literate to run or be a part of huge, successful organizations -- well, of course not!