I'm surprised Dropbox is still around, was it 15 years ago when I used? It was something new, but after they started pushing limitations I stopped using it.
I'm still a paying customer from somewhere before 2010, don't use it consistently but I've got a ton of things in there. Every time the anniversary rolls around in November I ponder how much effort to move off it for the not insignificant cost, but then the desire fades until about the next November :)