It's a bit confusing, because there are corporate booking sites, and then are third-party consumer sites. Apparently BW does not distinguish between them, but it's not exactly the only one.

At Choice Privileges, at least for promos, you need to be an elite member of sufficient level for corporate booking sites to count toward qualifying stays for the promo. Until you get to that sufficient elite level, you'll be treated not much better at Choice than at BW with corporate bookings.