I think that, TP-Link aside, consumer broadband routers in general have been a security problem.
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They are, unlike most devices, directly Internet-connected. That means that they really do need to be maintained more stringently than a lot of devices, because everyone has some level of access to them.
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People buying them are very value-conscious. Your typical consumer does not want to pay much for their broadband router. Businesses are going to be a lot more willing to put money into their firewall and/or pay for ongoing support. I think that you are going to have a hard time finding a market with consumers willing to pay for ongoing support for their consumer broadband router.
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Partly because home users are very value-conscious, any such provider of router updates might try to make money by data-mining activity. If users are wary of this, they are going to be even more unlikely to want to accept updates.
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Home users probably don't have any sort of computer inventory management system, tracking support for and replacing devices that fall out of support.
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People buying them often are not incredibly able to assess or aware of security implications.
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They can trivially see all Internet traffic in-and-out. They don't need to ARP-poison caches or anything to try to see what devices on the network are doing.
My impression is that there has been some movement from ISPs away from bring-your-own-device service, just because those ISPs don't want to deal with compromised devices on their network.
My understanding is that America doesn't actually have 5G telco equipment manufacturers
it's a weak point in the US tech lineup
which is one reason that there was such a major kerfuffle several years back over it. The US does not want China in its sensitive telco infrastructure. There was some point I remember where some US senator said that if Europe wasn't going to support Nokia or Ericsson
Europe does have some entrants -- and just let Huawei take the 5G market, that the US would need to buy one of them. There was some real concern from the US that Europe might just accept ceding the 5G provider market, which would make the US dependent on China.
kagis
This is probably what I remember. I could have sworn that it was a senator, but maybe there were multiple statements or it was actually AG Barr.
https://www.reuters.com/article/technology/white-house-dismisses-idea-of-us-buying-nokia-ericsson-to-challenge-huawei-idUSKBN2012A5/
EDIT: IIRC, Cisco or some other US company that I can't remember made some 5G hardware, but they weren't on par with Nokia and Ericsson.