That depends on how the product is marketed. If the product has any of those disabled features on the box and doesn’t outright say you need to send them telemetry data to use it, then you could argue that you bought it for that feature and can’t use it.
For instance, maybe I want to use the VPN feature, so I bought a router that supports that. And now I’m locked out of that feature unless I agree to a miles long privacy policy and sharing my telemetry data.
Plus, the lack of security updates is, at best, extremely concerning. The firewall’s primary function is to act as a first line of defense against attacks coming in via WAN. They have locked those security updates behind the telemetry sharing, and therefore it can’t even be used as a proper firewall.