The Pine64 PinePhone is $150-$200, with similar hardware provenance, but various open source projects that might at least give better software longevity and software trustworthiness. https://pine64.com/product-category/pinephone/
An additional consideration: as much as we like and respect our global colleagues, unfortunately I could see both hardware brands getting banned in some locales and by some organizations, like some other telecom brands have been banned. A phone that can't be used as a phone has little value, no matter how open it is.
For somewhat different provenance, the Purism Librem 5 is coming in at $800+, which is too high a high price point for most open source enthusiast contributors. https://shop.puri.sm/shop/librem-5/
And Purism's made-in-USA version, the Liberty Phone, is at $2K+. I guess maybe government or enterprise sales? https://shop.puri.sm/shop/liberty-phone/
I'm thinking that better for the Western open source developers and non-wealthy enthusiasts would be something more palatable to Western governments, and usable as a daily driver, like Librem 5, but priced somewhere in (guessing) $200-$400.