Comment by sbszllr
The quality and usefulness of it aside, the primary question is: are they still collecting chats for training data? If so, it limits how comfortable, and sometimes even permitted, people would with working on their yet-to-be-public work using this tool.
They don't call it PRISM for nothing my friend...
The collect chat records for any number of users, not the least of which being NSA surveillance and analysis - highly likely given what we know from the Snowden leaks.