its limited to 2GB, but you could increase it by installing the app on your phone and enabling the auto upload of pictures. every picture increased it by (iirc) 5MB - and this extra space stayed if you removed the pictures.
I know, I have used Dropbox since 2010 ;). But the free tier does not contribute to the revenue of Dropbox. There are no ads (except for Dropbox Pro/Business :p).
Dropbox has some deals with Samsung and others for coupons for certain phones, but most of the 1B is probably brought in by paid subscriptions. Since Dropbox costs $10 per month (plus some Packrat and Advanced Team users), there are roughly 8 million paying users who bring in the revenue. Since Dropbox has ~500 million users, that would be a conversion rate of 1.6%, which seems reasonable.
its limited to 2GB, but you could increase it by installing the app on your phone and enabling the auto upload of pictures. every picture increased it by (iirc) 5MB - and this extra space stayed if you removed the pictures.
haven't used it in ages though.