Now that we've got non-gravatar profile pictures, we should have the same functionality in careers. It still only allows gravatar pictures.There's an [old pre-native picture question] asking basically the same, but seeing that it has an accepted answer I created a new one.
Sorry for the lack of response here. We've always intended to do this, but it turns out that fixing this was more complicated than simply copying the implementation we have on Stack Overflow.
Our development and design resources are stretched pretty thin at the moment, so I can't make promises that this will be resolved immediately or in the next couple of weeks, but this pain point is still there, we're still aware of it, and I am confident we'll eliminate it in the next 6 months. Thanks for your patience – bear with us just a little bit longer.