I think part of the problem is not the original map data exactly, but the scanning of it. It was Landmark (someone may correct me) who originally scanned the data and made it available via the Athens licensing services to Universities and other educational institutions as part of their subscription services. I imagine their "right to charge" or copyright licensing is not to the original maps as such but rather the digital copy/data of them, just as Google are now doing. They are I suppose charging for the work they have done in scanning/indexing/tiling etc. the original maps into the digital form we can use.
In passing I much prefer the old "county" series 25" OS mapping to its modern digital counterparts, which are very sterile and lacking in surface feature detail, following the trend begun by the 1960s 6" and 25" National Grid ones.
Let's hope they recant, I cannot imagine that they actually lost potential customers because of the availability of the Enhanced zoom features. The people who want, and will pay for, the maps as a wall display picture will do so whatever level of zoom is produced, while the rest of us who are interested in how the historical landscape has changed would not have bought them anyway, as too expensive for the use we make of them.
The browser app always stated that the images were "not for commercial use" ie resale or similar, and I think they would be quite within their rights to take legal action against anyone trying to do that. Depriving the rest of us of access to such a valuable (in a non monetary sense) resource which we have no intention of using for gain is just sad. 😢
Its the way the world is going.....
Cheers
Grahami
The map is the territory - especially in chain scale.