Quote - Their talking about changing the terms of use for future releases.
It is illegal to alter a TOS agreement after the fact.

Yes, you are correct. They cannot change the TOS after they have posted them for a product which has subsequently already been downloaded. IOW, you cannot change licensing and make things retroactive to previous users.

Our company purchased some voice technology from AT&T which allowed me to use it in products. They later changed their TOS for the exact same product, but could not and did not try to enforce the newly applied changes in license to older licensees.

Of course, they didn't have a forum from which to do it from ;-)

IOW, just because folks are spouting about it in the forum, doesn't change the actual legal terms for products distributed. That has to be explicitly done in the license agreement, and no amout of chatter in the forums can change it.