Because of this, I'm going to plan my next network upgrade based on open source hardware like Banana Pi. My setup is based on WiFi 7 so this might not apply for a few years. From my understanding, the hardware from proprietary manufacturers is sufficiently advanced to do some advanced surveillance and spyware, whereas previous generations didn't require advanced processing to achieve fiber optic speeds. Back to the original statement, it's clear that the threat of surveillance exists.
Personally, I don't make the distinction between foreign and domestically produced routers in America. In fact, I trust foreign produced routers more because the likelihood that they can act upon their surveillance is significantly lower than the current American regime's oppressive and malicious tactics. Therefore, open source routers provides enough transparency to effectively eliminate spyware threats from all angles while being compliant.
I'm especially excited about the Banana Pi because of the transparency and potential of modular upgrades. Whenever there's a network issue, I have to consider whether the manufacturer (American or not) is doing something nefarious. With a Pi based router, I have much more peace of mind with network debugging issues.
There are several vendors of small computers usable as routers/firewalls and who provide complete hardware documentation, including schematics and PCB layout. Some of them also provide an extensive list of accessories, including cases with good passive cooling.
Besides BananaPi, there are e.g. ODROID (Hardkernel from South Korea), FriendlyElec, Radxa.
IMHO an underrated comment. The CCP isn't going to break down my door in the middle of the night, but I'm sure I'm on lists at the FBI and ATF just for my political org memberships alone. I think a foreign actor is more likely to use compromised hardware to create service interruptions and general chaos in the event they are attacked by our government, not come put me in a gulag.
The only thing I'm missing right now that would be a nice to have is a wifi card so I can ditch my access point. My hardware isn't open source by any means, but my reliance on non-free networking code is minimal.