Dropbox could be much more dependent on Python 2 than the average user, because from what I've read, they use a heavily modified version of the interpreter for

Dropbox could be much more dependent on Python 2 than the average user, because from what I've read, they use a heavily modified version of the interpreter for obfuscation purposes (e.g. scrambling of opcodes). On internal projects, that is likely to be different, of course.