They're describing different things, and the strict meanings are worth holding onto because the loose usage is everywhere.
A buyer list is one operator's own database of cash buyers. Deals flow through the operator, and the operator picks who gets the call. That's the core asset in the dispo-only model.
A marketplace, strictly, is a platform where deals come from many independent sources and are matched to buyers the platform vets, with the platform sitting in the middle rather than owning either side. The platform's product is the matching itself.
Dispo network is the loose term. In practice it means anything from a group of wholesalers who text each other deals to a paid community. There's no strict definition, so when someone says it, ask whether deals come from one source or many, and whether buyers were verified by anyone.
On @ledger's point, the fee model does tell you a lot, and the other thing to ask is what vetting means at that specific place. Vetted buyer should mean someone checked proof of funds and past closings. Vetted deal should mean someone confirmed a real signed contract exists with a real seller and an end date. Plenty of sites use the word for neither. Ask which of the two they check and who does the checking, and if the answer is vague, treat the site as a bulletin board and do the work yourself.
One practical note. Posting deals on a public platform is still marketing a property you don't own, and whether that triggers real estate licensing rules depends on your state, with a few having tightened the rules. Confirm with a real estate attorney where you operate before you post.
