The FuriPhone FLX1 meets all of your requirements:

• It runs the Debian-based FuriOS, which is FOSS.
• Among phones with Linux (excluding Android) preloaded, its specifications are among the best available, including a camera with PDAF and OIS, a 120Hz screen, and a replaceable 5,000 mAh battery. It also supports 5G and VoLTE, and has IP68 water resistance.
• FuriOS includes Android app support via a fork of Waydroid.
• The phone and the Linux distro are actively maintained.
• Furi Labs is based in Hong Kong.

Nintendo restricting game and app access on the Switch is also anticompetitive. However, Apple’s anticompetitive restrictions on iOS are a higher-priority problem because smartphones are essential communication devices while video game consoles are not.