The best option is to use open source openwrt firmwares… Unfortunately, while as alzhao says, the gl-inet firmware is mostly opensource, the fact that there are closed source drivers and packages at all means that it should be considered still as non-verifiable.

You really should not trust any router devices and each individual client device should be secured with at least encrypted DNS, if not on-device VPN.

The most worrying aspect though is probably not the hardware - gl-inet is probably better than tp-link and others since the firmware is much less opaque.

However, what might now be considered much less trustworthy would be any of the online services - such as the new astro-relay or any remote management tools they offer. It might not be a case of gl-inet themselves, but the changing infrastructure they now depend upon.

If you want cheap, open source, verifiable router devices there are still not many options that I would consider much safer … perhaps a homemade raspberry pi based device?

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