Not actually true. When you install the software required for the addons to install, it says quite clearly:
> The software contained herein (the "Software") is made available to you ("You") solely pursuant to the terms of the agreement that You previously entered into with Bloomberg ("Bloomberg Agreement"). IF YOU HAVE NOT ENTERED INTO THE BLOOMBERG AGREEMENT, YOU ARE NOT AUTHORIZED TO INSTALL, RUN AND/OR OPERATE THE SOFTWARE OR ANY PORTION THEREOF IN ANY MANNER WHATSOEVER.
I think that's pretty darn clear if you ask me.
Besides that, in the agreement itself well ... actually it's kind of vague, because it's sooo dang long and in such small print that I fell asleep hunting for it: https://www.documentcloud.org/documents/700565-bloomberg-ter...
I suppose in the long run, as long as you aren't redistributing it or making a profit off its use, Bloomberg considers its data more valuable than its terminal software or fonts. After all, they do make it publicly available for download without a license agreement. (Shakes fist at Oracle/Sun...)