The problem is, Google actively advertises their reliability and does not actively encourage backing up your account to protect yourself from Google deleting you. As many people perceive that Google is incredibly unlikely to lose your data, this isn't usually thought of the way you immediately tend to think you need a backup of your hard drive in your PC.

Very few people backup their Google account regularly (or at all), even though Google Takeout is available. People should, but I'd argue part of the burden is on Google for misleading them into thinking they don't need to.