Hey I don't go here but I seriously don't see what the big deal is? This event is obviously hosted by the Women in Computer Science group as noted in the bottom right corner of the flyer (also this poster doesn't even look like it was made by Dropbox). WiCS groups at other universities do this all the time...
The events are usually part of a sponsorship deal. If the company gives the organization some money (maybe a few thousand dollars), they can come one to a few times a semester. I know because I've seen the sponsorship packages for the WiCS group at another top university.
Evidence that other WiCS groups have events like this all the time:
CLEARLY written:
WiCS hosts company tech talks, info sessions, panels, and other recruiting events throughout the year, for a total of roughly 15 events per month.
LiveRamp Tech Talk Coffee break with Intel