Well, I just bought a:

https://www.gl-inet.com/en-de/products/gl-be14000

so.. yes? I haven't gotten around to flashing stock openwrt on it - but I probably will at some point - seems to be supported now?

https://forum.gl-inet.com/t/flint-4-openwrt-vanilla/71383/10

I think it would be difficult to compete with existing offerings - even though they are quite few.