Is memmy made from Swift UI?
Memmy is written using react-native. You can check the code for Memmy here: https://github.com/Memmy-App/memmy
I think the average person just simply doesn't care about their privacy.
It might not be. Plenty of US states are coming online with privacy rights. If you live in CA, CO, CT or VA you can submit requests to opt out of information sales and for sites to erase your data.
