Former Technology Director for TL here - I maintained and deeply extended their hotline software. We took confidentiality and anonymity very, very seriously. Operators never, ever see the phone number of the caller, and vice versa. Only admins can even look up a caller by phone number. There were other technical measures as well, but I'm not going to give them up in a public forum, hope that's understandable.
Thank you, ketzo. Unfortunately I'm no longer with the org and can't say for sure that they wouldn't ever try to do something like this. I'm working with a new group now on open source peer support software that also values privacy.
That is an excellent qualification to make. You only know as much as you've seen and what happens after you turn your back is hopefully more of the same or better but that is no guarantee. Kudos for seeing this sharp.