I wouldn't worry about it. There are tons of reasons for lack of response that are more likely than this kind of backchannelling, i.e. the tough job market, and end of year (new reqs likely to open in January). And fear of legal consequences generally keeps companies from oversharing on employee matters anyways (though I could see inexperienced founders not adhering here). Anyways, good luck, I think it's just the timing here that's not ideal.