Reddit's zero vote submissions

It looks like there are many submissions now being downvoted across many subs.

Before the API change I never really noticed mass submissions with zero votes. Now i see multiple zero vote submissions daily and I browse Reddit for about 20 minutes a day. My feed is set to sort by hot, so I don't see many submissions that have just been created.

Is this a sign of the type of people using Reddit these days, a lack of moderation, or could there be some bots floating mass downvoting?