Spotlight is enabled by default _and_ left enabled on basically all the Macs and Mac users are actually a big userbase for Dropbox. It is very unlikely Dropnox team will forget that Spotlight indexing is running in the background.
Does not mean the files will get indexed, but there is no chance that Spotlight will trigger a unexpected terabyte download in the background.
Does not mean the files will get indexed, but there is no chance that Spotlight will trigger a unexpected terabyte download in the background.