on subscription - we're committed to never adding one.
on accuracy - we've been running daily tests against all the major competitors and while results vary device to device, we're definitely in the competitive range. closest results we've seen are with oura actually in terms of numbers.
and yeah on selling health data - that's part of our vision! a marketplace where you can choose to share anonymized data with researchers and actually get paid for it.
good question! MPC is interesting tech but probably overkill for what we're doing. we're exploring more approaches tho. the crypto/privacy tech space moves fast so we're keeping an eye on different solutions.
we've actually got about 5000 preorders and a closed beta group of ~50 people who've been testing the app with us for months. so that's probably where they're coming from - long-time community members who just don't usually post on HN but got excited to see us launch here. feel free to hop in our Discord and check them out - i can assure you they're not bots lol https://discord.com/invite/pulsemode
definitely understand the skepticism though! happy to answer any other questions about the actual product
and yeah on selling health data - that's part of our vision! a marketplace where you can choose to share anonymized data with researchers and actually get paid for it.