People that still use it will think "of course!" and tell you so. People that don't use it anymore will think "probably not, but maybe; I wouldn't know myself"

People that still use it will think "of course!" and tell you so. People that don't use it anymore will think "probably not, but maybe; I wouldn't know myself" and thus be silent. So you have a high prior chance of getting a ton of "yes" answers even if the real answer is "no".