I started checking for added sugar in dried fruit... probably 2 decades ago, when I first saw un-sulfured, un-sweetened dried pineapple, and thought "huh? why would they need to point out that it's unsweetened?" So I checked the labels on the pretty dried pineapple, and yep, turned out they had sugar added to them along with the sulfur, to keep them looking pretty.
So I started checking some other dried fruit, and have checked it occasionally since then. Almost all of it has sugar added - pineapple, bananas, mango, blueberries, cranberries, apples, apricots, papaya, etc. As if drying them doesn't concentrate the sugar content enough.
Usually raisins don't have sugar added, but that's not always absolutely certain either. I think part of the reason is that sugar is a preservative, along with the sulfuring which also preserves color, and they usually add some kind of oils to keep the dried fruit somewhat leathery, instead of it needing to be almost crackly dry so that it doesn't get moldy in storage.
I haven't seen any dried strawberries in the stores that are sugared, but I think that's mainly because the dried strawberries I've seen are always freeze dried, instead of just air and heat dried. (not that they can't be air and heat dried, or had sugar added - I just haven't personally come across any commercially available dried strawberries that were not freeze dried without added sugar.)