I don't know much about Paterson but I'm very familiar with reddit. However, having Reddit to merge with another PLATFORM will be huge advantage to reddit because they already have readers and teh mergers will definitely increase their visibility to the general people and to the other platform they are merging with as well.
Well Reddit is one of the biggest and most visited websites on the internet. The reason is that you can see virtually all the niches and group you can ever think of on the sites. So for them to Marge with another company shows that they do everything possible to increase their web based and control more audience. The Reddit owner is known for business acumen who always strife to achieve better user experience on his website.
This merger between these two companies will be a big boost to them it,
will boost their client or customer base, it will increase their advert rate, it will make them to be more popular and more capable in their various segment of influence. Reddit is one of the best site ever, for it to team with another company means it has seen a great potential in such a merger.