When a user signs up for reddit, the few (8 subreddits to be precise) are subscribed automatically which show up in the front page of the reddit.
With the recent turmoil among the moderators of r/technology, reddit seems to have removed it from its default status.
Talks about auto moderator (bot) being used which banned certain words categorized as political came into light recently. Most of the users were not given a chance to discuss about this which led to internal turmoil among the moderators & the users.
The above pic shows the list of banned word in r/technology