Free Delta miles for signing up for Le Club Accorhotels

View from the Wing reports a promotion where you can get 500 free Delta Skymiles simply by signing up for an account with Le Club Accorhotels.  While Delta miles aren’t generally considered all that valuable  (link is to a post about a debate on Delta Sky Miles that happened at this year’s New York Frequent Traveler University), who can complain about miles that you get for taking a couple minutes to register an account?