there is an imgur app now
https://itunes.apple.com/us/app/imgur/id639881495?mt=8
And as someone who always owns an ios and android product at the same time I still notice ios getting more quality stuff first all the time whether it's a game or productivity app of some kind. Exceptions here and there but rarely. Throw in tablet apps and it's a no contest.
The fact of the matter is, people who buy apple products are happy with the ecosystem and the product and the customer service. Whereas people who buy other products aren't. Hence the constantly fluctuations or outright plummeting sales.