Might this be what is happening?

[jmowreader]

6. Close

He has a "text to donate" app...http://www.nytimes.com/politics/first-draft/2016/01/29/sanders-campaign-introduces-text-to-donate-app/

He has a "drinking game" style app (no, I didn't come up with that)...http://www.buzzfeed.com/evanmcsan/sanders-launches-drinking-game-style-texting-donation-system#.gi8nLjo3E

The FEC's big problem isn't the kajillion $10 and $20 donations that add up to more than $2700, it's the 900 known donors that gave single contributions larger than $2700. Campaigns are supposed to have a mechanism - even if it's just a person sitting there mailing back checks that are too big - to reject outsized contributions, and Sanders doesn't appear to have one.