Accuracy isn't actually important for marketing. If you want to be accurate then Bitcoin mining isn't really mining, it's minting. Because you don't mine coins from the ground do you?
Maybe accurate isn't the right word - I'm actually talking about marketing.
When I hear "rewards" I think of a marketing gimmick. When I hear "dividends" or "interest" I think of banking. The better marketing decision may be to not use a "marketing" word.
I own a marketing firm here in Ontario, I've spent my entire adult life as a marketer...
Go with whichever has the most "perceived value". For me, it's unquestionably "interest". I put my wealth into something that has a high interest rate. I choose a credit card that gives me "rewards". The underlying incentives are totally different for each. BitUSD early adopters will park their wealth for the interest, not rewards.
Ultimately we're discussing semantics / psychology. The words we choose to describe our product are very important. If we use the wrong ones, someone else will use the right ones.