20GB limit
What the page linked to actually says is:
To prevent abuse, Dropbox has established the following limits for accounts:
Dropbox Basic and trials for Dropbox Standard, Advanced, and Enterprise: 20 GB of bandwidth and up to 100,000 file downloads per day.
Dropbox Plus, Family, Professional, and Standard: 1 TB of bandwidth and unlimited file downloads per day.
Dropbox Advanced and Enterprise: 4 TB of bandwidth and unlimited file downloads per day.
So it's not actually a problem after all.