“across the board we're seeing between an 80 to 85 response rate so completion rate of the surveys for new subscribers when doing that... they make it clear this is not just like market research data... we're getting this information so I can better serve you”

Frame surveys as "to serve you" for 80% completion

Position the post-signup survey as "so I can better serve you" — never as research. Keep questions to one-tap multiple choice, promise 15-20 seconds, and you'll consistently see 80-85% completion across audiences of all sizes. Position trumps every other survey-design lever.