These ads contain no images, only typography and in no more than three colours — a bold move for a company
that makes its money selling images.
(…)
Some typographers may critique the ads due to their hard-to-read nature,
however, what might not be apparent is that this was, in fact, very
intentional. What is unique about typography-heavy advertising is that it
requires more from the viewer than passive observation; it requires an
active participation — reading. The idea was to create a “block of type
out of blocky type,” and in all caps, so that it required cognitive
investment on the part of the reader, and made it memorable. Meadus figured
that the writing was interesting enough that the readers wouldn’t mind
being challenged to get through it, and “given the abrasive, pompous tone
of voice, it was fitting that they be hard to read.”
http://www.typeforyou.org/2011/07/01/fotolia-bold-move-with-only-type-ad/