My daily driver is a Linux phone running Ubuntu Touch. Besides that I have three more phones running other Linux projects, basically to test them, and to report bugs.
In addition to those devices, I also have another one running Lineage OS because I need some apps that I can't run in any other way, v.gr. Monash University Low FODMAP Diet App.
It is just a deal breaker in my book, and likely for others.
It isn't even obviously stated on their documentation either, yet their homepage has "Keep your data private with an operating system that's fully secure."
In addition to those devices, I also have another one running Lineage OS because I need some apps that I can't run in any other way, v.gr. Monash University Low FODMAP Diet App.