> If you can't get someone to pay €5/$5 per year for a service they use every single day, then there's something really wrong in how we as users think about the service we use every day.

Which is absolutely the case with most people and recurring payments, even with one time payments. If Signal costed money (even 1-2$), I could not have convinced even 10% of the people I got over to Signal - recurring or one time.