I wish Apple would get back into the WiFi router business again. I trust their privacy/security posture more than most other brands. Sadly they sell Linksys routers as the go to replacement for their previous products.
* source is available for the boot-loaders, all onboard devices.
* Firmware source available for all NPUs, 'offload engines', and other devices in Ethernet data path.
* mainline linux kernel supports a fully blob-free bootup (except Wifi/RF)
* a jumper enables trustzone access, with complete key management available to the enduser
* populated serial UART port header on the inside. (optional)
... Then I don't care who builds it. But I can't image Apple would build such a user-friendly device, that I could just easily install OpenWrt on 5 minutes out the box. Plus they'd probably fleece you.