The OnePlus 6 and 6T are quickly becoming among the most popular Linux phones around, thanks to near-full, stable mainline Linux support, active community and fast-evolving features.
The latest improvement to be deployed by its main maintainer, Caleb Connolly, is full support, including graphical acceleration, for the popular Android compatibility layer WayDroid (or "Anbox-halium", in spite of being a different project from the old Anbox). This uses the host kernel alongside a basic Android system image to integrate Android apps with Linux installs with potentially very little performance overhead.
Contrarily to the "old" Anbox used in most projects to this point, WayDroid is essentially a Lineage OS wrap exploiting the host kernel for lag-free experience, including graphical acceleration and some hardware support.
This has been already ported to the popular OnePlus 6/6T mainline Linux port, in order to allow for a more gradual departure, for most users, from the Google/Android ecosystem.
Update: A more recent piece of news is that WayDroid was also demonstrated to run, although with marginally slower performance, on the PinePhone.
For more information on the (still young) WayDroid/anbox-halium project, you can check their GitHub page (below) and the initial Reddit announcement.