I announced a public beta in a number of relevant Facebook groups, attaching a short description, a screen cast and a TestFlight link.
There's probably 20K people in those groups combined but I only got 2 people to actually install the beta via TestFlight.
So the main take away is that people are not that curious about trying out random beta versions of apps that happen to show up in their Facebook-feed. Who would have guessed? 😀
If you're differently inclined you can use this TestFlight link:
https://testflight.apple.com/join/7UKevRTn