If they have your telephone number, they either have or can get your address.
While I am extremely happy to see such high numbers, I agree that they are almost certainly still way too low. Like RKL, I don't do surveys. I mostly let all calls to my home go to the answering machine. If I answer because I'm expecting a call, and the caller is conducting a survey -- I just hang up.
No telephones were used in this this survey.
I guess I'm a little confused about who you are keeping the info from. The fed.gov has this much data and more just based on internet crawls, meta-data analysis, and financial records.
I doubt gun thieves are buying nationwide lists of the dark web, even if the survey company has some data breech.
The survey company itself could, I guess, be selling lists but the big ones make a big deal about not doing that for just this reason.
I'm not saying you have to answer, or answer truthfully, I just think the whole "I'd never answer a survey about guns" is a particularly Boomer-esque response that probably doesn't protect your info in any meaningful way, and probably does make it a little harder for the folks trying to mainstream 2A culture.
You do you though.