I never signed up to be on Expedia. I discovered a couple of weeks ago that my rental is now listed on Expedia. (It wasn't for several years.) I'm currently on PPB and I never knowingly agreed to pay a higher commission if I get a booking via the Expedia website. Take a look at your listing's "My Account > Property Details.
I don't especially care whether or not my listing is shown on Expedia. I'd prefer that it not be included and I definitely don't want to pay a higher commission for an Expedia booking.