Almost certainly a result of the spaces cabal and the (often unspoken of) prejudice against tab users. Don't think you make hiring decisions based on tabs vs spaces? Well you're part of the problem, then. I'm building an app to help you easily email your congressperson and ask them to create legislation requiring space/tab equality. This has to stop. Please consider donating to my Patreon.
I actually ask candidates "spaces or tabs?" in every single interview. I don't really care what the response is in regard to the holy war, and it doesn't mean anything on its own, but having SOME thought out response can be a GREAT indicator of how well versed someone is in general.
e.g. I'm going to think way more highly of someone that says "tabs, because then people can set the indentation render size to whatever they prefer in a way that doesn't affect other users" way more than someone who says "whatever my editor sets it to".
Also, fuck spaces. Long live tabs.