It’s banking:

https://slrpnk.net/post/28294479

The army of corporate boot lickers in the mobile phone context is largely composed of people who think banking on a smartphone is wise, despite the attack surface and despite the bank being empowered to monitor their customers more closely. Banking apps are the most significant culprit for gluing people to Android.

We may never see the day when more than 5% of the population realises the importance of FOSS enough to shake free of their addiction to convenience.