Foundries don't license fonts for "desktop use" on seemingly generous terms out of the goodness of their hearts. It's because they have no choice. Letterforms are not copyrightable. The font file†, however, is. Once a typeset character sequence is printed or rasterized and flashed on the screen, any license that a foundry cooks up trying to control that use would be unenforceable. The only leverage they have is controlling the distribution of the file. As it turns out, due to the way Web fonts work, this means they do have leverage on the Web—for technical reasons.
If the foundries had a choice, they wouldn't opt to license Web fonts more generously, they'd opt to extract more money out of the traditional uses.
(Note that this is written from the perspective of the way that copyright works in the US.)
† EDIT: I realized just now while brushing my teeth that this might lead to further mistaken understanding when put this way. So pretend instead that I said something like "what's in the font file", and pay particular attention to <https://ansuz.sooke.bc.ca/entry/23>.