[cmorgan8506]

The following is mostly speculation. I don't really know the inner workings of the Reddit business model.

Businesses that rely on advertising revenue will always seek optimal channels for peoples attention. The mobile app gives them two very import things:

1. Push notifications. Push notifications give companies the ability to advertise to you without you even visiting their website. Also, it allows them to piggyback on the Pavlovian response that has been conditioned in your brain by smart phone companies. Essentially this allows them to "mainline" their product into your brain. Just woke up? McDonalds breakfast PN. End of a long day of work? PN from reddit to remind you to binge their content for your entire evening.

2. People can't run adblock on mobile applications. Even if that only accounts for 10% of it's users, it's still a huge increase in ad revenue.